https://www.imcdb.org/vehicle_2051547-Ford-Endeavour-U268-2003.html
https://www.imcdb.org/vehicle_2051545.html

https://www.imcdb.org/vehicle_2051170-Maruti-Suzuki-Wagon-R-2000.html
https://www.imcdb.org/vehicle_2051155-Maruti-Suzuki-Wagon-R-2000.html

https://www.imcdb.org/vehicle_2051143-Tempo-Traveller-1987.html
https://www.imcdb.org/vehicle_2051160-Tempo-Traveller-1987.html

Same Model:
https://www.imcdb.org/vehicle_1877044-Acura-RL-KB1-2005.html
https://www.imcdb.org/vehicle_1829953-Honda-Legend-KB1-2004.html

https://www.imcdb.org/vehicle_2049791-Mercedes-Benz.html
https://www.imcdb.org/vehicle_2049856-Mercedes-Benz-ML-350-W166-2014.html

https://www.imcdb.org/vehicle_2049829-Bentley-Mulsanne.html
https://www.imcdb.org/vehicle_2049843-Bentley-Continental-Flying-Spur.html

https://www.imcdb.org/vehicle_2049375-BMW.html
https://www.imcdb.org/vehicle_2049376-BMW.html

https://www.imcdb.org/vehicle_2049422-Iveco.html
https://www.imcdb.org/vehicle_2049387-Nissan-Interstar-X70-2004.html

https://www.imcdb.org/vehicle_2049407-Kia-Picanto-SA-2005.html
https://www.imcdb.org/vehicle_2049416-Kia-Picanto-SA-2005.html

https://www.imcdb.org/vehicle_2049386-Mercedes-Benz-E-Klasse-W211.html
https://www.imcdb.org/vehicle_2049404-Mercedes-Benz-E-Klasse-W211.html

https://www.imcdb.org/vehicle_2049393-Renault-Clio-X65-2001.html
https://www.imcdb.org/vehicle_2049394-Renault-Clio-X65-2001.html

https://www.imcdb.org/vehicle_2049399-Toyota.html
https://www.imcdb.org/vehicle_2049402-Toyota.html

https://www.imcdb.org/vehicle_2049390-Toyota.html
https://www.imcdb.org/vehicle_2049379-Toyota.html

https://www.imcdb.org/vehicle_2049356-Ford-Ikon-2000.html
https://www.imcdb.org/vehicle_2049371-Ford-Ikon-2000.html

https://www.imcdb.org/vehicle_2049016-Tata-Sumo-1994.html
https://www.imcdb.org/vehicle_2049044-Tata-Sumo.html

https://www.imcdb.org/vehicle_2048947-Maruti-Suzuki-Gypsy.html
https://www.imcdb.org/vehicle_2048946-Maruti-Suzuki-Gypsy.html

https://www.imcdb.org/vehicle_2048935-Hindustan-Ambassador-1979.html
https://www.imcdb.org/vehicle_2048940-Hindustan-Ambassador-1979.html

https://www.imcdb.org/vehicle_2048927-Maruti-800-SB308-1995.html
https://www.imcdb.org/vehicle_2048925-Maruti-800-SB308-1998.html

https://www.imcdb.org/vehicle_2048922-Maruti-Suzuki-Omni-1988.html
https://www.imcdb.org/vehicle_2048923-Maruti-Suzuki-Omni-1988.html

https://www.imcdb.org/vehicle_2049364-Mitsubishi-Lancer-CK-1998.html
https://www.imcdb.org/vehicle_2049370-Mitsubishi-Lancer-CK-1998.html

You posted two times the same link

Same Scooters:
https://www.imcdb.org/vehicle_477538-Hyosung-Prima-Rally.html
https://www.imcdb.org/vehicle_477538-Hyosung-Prima-Rally.html

https://www.imcdb.org/vehicle_1789965-Guangzhou-Peugeot-505-1989.html
https://www.imcdb.org/vehicle_2048227.html

https://www.imcdb.org/vehicle_2048199.html
https://www.imcdb.org/vehicle_1764398-Fudi-Explorer-II-2003.html

https://www.imcdb.org/vehicle_1917983-Ford-Transit-1966.html
https://www.imcdb.org/vehicle_1917982-Ford-Transit-1966.html

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).