About Mazda 3 and 323

For the 3rd gen. Mazda 3, pre-facelift model use [BM], facelift model use [BN]
For reference:
https://www.imcdb.org/vehicle_1715097-Mazda-3-BM-2014.html
https://en.wikipedia.org/wiki/List_of_Mazda_model_codes#Model_codes

Chassis code for these are [BM]
https://www.imcdb.org/vehicle_1869226-Mazda-3.html 2014+
https://www.imcdb.org/vehicle_1691881-Mazda-3.html 2014+
https://www.imcdb.org/vehicle_1635504-Mazda-3.html 2014+
https://www.imcdb.org/vehicle_1603424-Mazda-3-BN.html 2014+
https://www.imcdb.org/vehicle_1672999-Mazda-3-BN.html 2014+
https://www.imcdb.org/vehicle_1731618-Mazda-3-BN.html 2014+
https://www.imcdb.org/vehicle_1269947-Mazda-3-BM-2017.html 2014+
https://www.imcdb.org/vehicle_1095257-Mazda-3-BM-2017.html 2014+
https://www.imcdb.org/vehicle_1766041-Mazda-3-BN-2014.html
https://www.imcdb.org/vehicle_1845894-Mazda-3-BN-2014.html
https://www.imcdb.org/vehicle_1744132-Mazda-3-BN-2014.html
https://www.imcdb.org/vehicle_1845894-Mazda-3-BN-2014.html
https://www.imcdb.org/vehicle_1260763-Mazda-3-BN-2014.html
https://www.imcdb.org/vehicle_1205220-Mazda-3-BN-2014.html
https://www.imcdb.org/vehicle_1693667-Mazda-3-BN-2014.html
https://www.imcdb.org/vehicle_1809540-Mazda-3-2014.html
https://www.imcdb.org/vehicle_1485956-Mazda-3-2014.html

Chassis code for these are [BN]
https://www.imcdb.org/vehicle_1745458-Mazda-3.html 2017+
https://www.imcdb.org/vehicle_1679013-Mazda-3-BN.html 2017+
https://www.imcdb.org/vehicle_1747215-Mazda-3-BN-2014.html 2017+
https://www.imcdb.org/vehicle_1780512-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1679048-Mazda-3-BM-2018.html
https://www.imcdb.org/vehicle_1852938-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1549339-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1649896-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1718956-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1736341-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1756427-Mazda-3-BM-2017.html.
https://www.imcdb.org/vehicle_1216585-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1233970-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1468124-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1512312-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1540949-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1593759-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1645924-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1697205-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1168390-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1202455-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1085015-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1280749-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1388387-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1427141-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1459107-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1492300-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1839086-Mazda-3-BM-2017.html
https://www.imcdb.org/vehicle_1626315-Mazda-3-BM-2016.html


Chassis code for these are [FA4]
https://www.imcdb.org/vehicle_707453-Mazda-323-1978.html
https://www.imcdb.org/vehicle_760499-Mazda-323-1979.html
https://www.imcdb.org/vehicle_1246027-Mazda-323-1979.html
https://www.imcdb.org/vehicle_1611958-Mazda-323-Wagon.html

Chassis code for these are [BD]
https://www.imcdb.org/vehicle_765036-Mazda-323-1980.html
https://www.imcdb.org/vehicle_713231-Mazda-323-1984.html
https://www.imcdb.org/vehicle_1438665-Mazda-323-1984.html
https://www.imcdb.org/vehicle_883233-Mazda-323-1985.html
https://www.imcdb.org/vehicle_1055295-Mazda-323-1985.html

Chassis code for these are [BF]
https://www.imcdb.org/vehicle_807542-Mazda-323-1987.html
https://www.imcdb.org/vehicle_1372759-Mazda-323-BD-1990.html
https://www.imcdb.org/vehicle_1376704-Mazda-323-1993.html

Chassis code for these are [BG]
https://www.imcdb.org/vehicle_1611994-Mazda-323-1990.html
https://www.imcdb.org/vehicle_1609613-Mazda-323-1990.html
https://www.imcdb.org/vehicle_717124-Mazda-323-1990.html
https://www.imcdb.org/vehicle_1173527-Mazda-323-BF-1992.html


Chassis code for these are [BW] BF for sedan/ hatch, BW for wagon
For reference: https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Mazda&model=B- W
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=8&make=Mazda&model=B- F
https://www.imcdb.org/vehicle_975550-Mazda-323-Station-Wagon-1989.html
https://www.imcdb.org/vehicle_1234630-Mazda-323-Wagon.html

For these are hatchback
https://www.imcdb.org/vehicle_851553-Mazda-323-C-BA-1995.html
https://www.imcdb.org/vehicle_87833-Mazda-323-Astina-BJ-1998.html
https://www.imcdb.org/vehicle_739956-Mazda-323-BF-1989.html
https://www.imcdb.org/vehicle_537143-Mazda-323-F-BJ-2001.html
https://www.imcdb.org/vehicle_1173254-Mazda-323-Astina-BJ-1999.html
https://www.imcdb.org/vehicle_810870-Mazda-323-Isamu-BJ-2000.html
https://www.imcdb.org/vehicle_1827070-Mazda-Familia-BJ-1998.html
https://www.imcdb.org/vehicle_501454-Mazda-Familia-S-Wagon-BJ-1998.html

As for those use [BH/ BA] code, I'll sort it out after someone more familiar with [BH/ BA] can confirm that the information is correct.