Both have a role and are different color, they can stay separated (especially with a "big" role)
Regrouping is more for background cars, or when the cars seem really similar (same color).

https://www.imcdb.org/vehicle_2045587-Cadillac-DeVille-Concours-1994.html
https://www.imcdb.org/vehicle_2045573-Cadillac.html

https://www.imcdb.org/vehicle_2045137-Hummer.html
https://www.imcdb.org/vehicle_887985-Hummer-HMCO-1996.html

Same:
https://www.imcdb.org/vehicle_1754426-Hyundai-Porter-1996.html
https://www.imcdb.org/vehicle_1754885-Hyundai-Porter-1996.html

Same:
https://www.imcdb.org/vehicle_2039691-Chevrolet-Silverado-GMT901-2007.html
https://www.imcdb.org/vehicle_2042719.html

https://www.imcdb.org/vehicle_2039696-Mercedes-Benz-G-Klasse-W463-2002.html
https://www.imcdb.org/vehicle_2042638-Mercedes-Benz-G-Klasse-W463.html

https://www.imcdb.org/vehicle_2042639.html
https://www.imcdb.org/vehicle_2039695-Infiniti-QX80-Z62-2018.html

https://www.imcdb.org/vehicle_2039694-Ford-Escape-U204-2005.html
https://www.imcdb.org/vehicle_2042637.html

Thanks

https://www.imcdb.org/vehicle_1799834-Fiat-Ducato-250-2007.html
https://www.imcdb.org/vehicle_1799180.html


Thanks, small oversight for the deletion of a vehicle despite its addition in comment.
https://www.imcdb.org/vehicle_1715937-GMC-Sierra-GMT902-2007.html
https://www.imcdb.org/vehicle_1715960-GMC-Sierra-GMT902-2007.html

Thanks, I regrouped most, keeping only some with role and/or well visible separated

https://www.imcdb.org/vehicle_1272929-Cadillac-Escalade-GMTK2XL-2015.html
https://www.imcdb.org/vehicle_1854171-Cadillac-Escalade-GMTK2XL-2015.html

https://www.imcdb.org/vehicle_1854128-Chevrolet-Impala-GMX210-2000.html
https://www.imcdb.org/vehicle_1125934-Chevrolet-Impala-GMX210-2000.html

https://www.imcdb.org/vehicle_2042239-Chevrolet-Silverado-GMT800-2004.html
https://www.imcdb.org/vehicle_1329596-Chevrolet-Silverado-GMT800-2004.html

https://www.imcdb.org/vehicle_1715943-Chrysler-300-LX-2015.html
https://www.imcdb.org/vehicle_1345639-Chrysler-300-LX-2015.html

https://www.imcdb.org/vehicle_1345620-Dodge-Ram-2002.html
https://www.imcdb.org/vehicle_1329595-Dodge-Ram-2002.html

https://www.imcdb.org/vehicle_1272912-Ford-Econoline-E-350-1992.html
https://www.imcdb.org/vehicle_1103898-Ford-Econoline-E-350-1992.html

https://www.imcdb.org/vehicle_1272681-Ford-F-150-PN96-2001.html
https://www.imcdb.org/vehicle_1119609-Ford-F-150-PN96-2001.html
https://www.imcdb.org/vehicle_2020160-Ford-F-150-PN96-2001.html

https://www.imcdb.org/vehicle_1715937-GMC-Sierra-GMT902-2007.html
https://www.imcdb.org/vehicle_1715960-GMC-Sierra-GMT902-2007.html

https://www.imcdb.org/vehicle_1272577-Honda-Civic-ES-2001.html
https://www.imcdb.org/vehicle_1102364-Honda-Civic-ES-2001.html

https://www.imcdb.org/vehicle_1387149-Honda-Civic-Coup%C3%A9-EJ-1999.html
https://www.imcdb.org/vehicle_1272953-Honda-Civic-Coup%C3%A9-EJ8-1999.html

https://www.imcdb.org/vehicle_1119603-Honda-CRF-250-R.html
https://www.imcdb.org/vehicle_1852196-Honda-CRF-250-R.html

https://www.imcdb.org/vehicle_1329607-Jeep-Grand-Cherokee-WK2-2017.html
https://www.imcdb.org/vehicle_1103913-Jeep-Grand-Cherokee-WK2-2017.html

https://www.imcdb.org/vehicle_1103482-Jeep-Wrangler-YJ-1987.html
https://www.imcdb.org/vehicle_1102353-Jeep-Wrangler-YJ-1987.html

https://www.imcdb.org/vehicle_1103477-Lamborghini-Hurac%C3%A1n-LP-580-2-2016.html
https://www.imcdb.org/vehicle_1144604-Lamborghini-Hurac%C3%A1n-LP-580-2-2016.html

https://www.imcdb.org/vehicle_1119618-Maserati-Ghibli-M157-2014.html
https://www.imcdb.org/vehicle_1854169-Maserati-Ghibli-M157-2014.html

https://www.imcdb.org/vehicle_1988666-Mazda-3-BM-2014.html
https://www.imcdb.org/vehicle_1151148-Mazda-3-BM-2014.html

https://www.imcdb.org/vehicle_2042208-Mercedes-Benz-S-430-V220-2000.html
https://www.imcdb.org/vehicle_1272672-Mercedes-Benz-S-Klasse-V220-2000.html

https://www.imcdb.org/vehicle_1614310-Nissan-Versa-N17-2015.html
https://www.imcdb.org/vehicle_1515536-Nissan-Versa-N17-2015.html

https://www.imcdb.org/vehicle_2042295-Porsche-911-GT3-RS-991-2015.html
https://www.imcdb.org/vehicle_1273437-Porsche-911-GT3-RS-991-2015.html

https://www.imcdb.org/vehicle_1103911-Toyota-Corolla-ZRE172-2014.html
https://www.imcdb.org/vehicle_1139362-Toyota-Corolla-ZRE172-2014.html

https://www.imcdb.org/vehicle_1988700-Toyota-Sienna-MCL20-2004.html
https://www.imcdb.org/vehicle_1119610-Toyota-Sienna-MCL20-2004.html

https://www.imcdb.org/vehicle_1515523-Volkswagen-Sedan-Typ-1.html
https://www.imcdb.org/vehicle_1591685-Volkswagen-Sedan-Typ-1.html

https://www.imcdb.org/vehicle_1761891-Toyota-Crown-Majesta-S200-2009.html
https://www.imcdb.org/vehicle_1761890.html