Thanks, indeed sometimes errors make some vehicles listed separately
I changed the last one to VW Baja Bug (it looks more like that than the Dune Buggies)

About the Cizeta and Cugnot, I added a comment after yours, as I'd like possibly opinion of others before doing the changes.

These three are all the same cars, listed three different ways
https://www.imcdb.org/vehicles.php?make=Chesil&model=356+A+Speedster
https://www.imcdb.org/vehicles.php?make=Chesil&model=Speedster
https://www.imcdb.org/vehicles.php?make=Chesil&model=Speedster+Porsche+356+Repli- ca

"Caterpillar 22" should be "Twenty-Two" -> https://www.imcdb.org/vehicles.php?make=Caterpillar&model=Twenty-Two
https://www.imcdb.org/vehicle_462840-Caterpillar-22.html
https://www.imcdb.org/vehicle_1692050-Caterpillar-22.html

Same thing listed two different ways
https://www.imcdb.org/vehicles_make-Chevrolet_model-CERV-III.html
https://www.imcdb.org/vehicles.php?make=Chevrolet&model=Corvette+CERV+III

Same things
https://www.imcdb.org/vehicles_make-Chevrolet_model-Apache.html
https://www.imcdb.org/vehicles.php?make=Chevrolet&model=Task-Force+Apache

Same things
https://www.imcdb.org/vehicles_make-Cizeta_model-V16T.html
https://www.imcdb.org/vehicles.php?make=Cizeta-Moroder&model=V16T

"Heavy-Duty" instead of "Heavy Duty" -> https://www.imcdb.org/vehicles.php?make=Chevrolet&model=Heavy-Duty
https://www.imcdb.org/vehicle_1938417-Chevrolet-Heavy-Duty-1939.html

"Chungseong" instead of "Chungsong" -> https://www.imcdb.org/vehicles_make-Chungseong.html
https://www.imcdb.org/vehicle_1181770-Chungsong.html

These are all replicas of the same vehicle, but only one of the 6 is listed as a replica
https://www.imcdb.org/vehicles_make-Cugnot.html

Same thing, 2 out of 3 listed as replica
https://www.imcdb.org/vehicles.php?make=Custom+Made&model=Bugatti

"Dune Bug" to "Dune Buggy" -> https://www.imcdb.org/vehicles.php?make=Custom+Made&model=Dune+Buggy
https://www.imcdb.org/vehicle_1527095-Custom-Made-Dune-Bug.html

http://www.imcdb.org/vehicle_2033634-Mahindra-Scorpio-2006.html
http://www.imcdb.org/vehicle_2033623.html

https://www.imcdb.org/vehicle_2033577-Bajaj-RE.html
https://www.imcdb.org/vehicle_2033627.html

https://www.imcdb.org/vehicle_2026036-Peugeot-207-2006.html
https://www.imcdb.org/vehicle_2026485-Peugeot-207-2006.html

For the Mercedes, maybe a different year can be found for the 2-star ones? I'm not sure they should be regrouped (as they have a role, and it is a movie rather than a series)

https://www.imcdb.org/vehicle_2002085-Mercedes-Benz-220-SE-W111.html
https://www.imcdb.org/vehicle_2002080-Mercedes-Benz.html
https://www.imcdb.org/vehicle_2002089-Mercedes-Benz.html

https://www.imcdb.org/vehicle_1985221-Scania-4-Series-1995.html
https://www.imcdb.org/vehicle_1985219-Scania-4-Series-1995.html
(the same truck)

https://www.imcdb.org/vehicle_2000342-Hindustan-Ambassador-1979.html
https://www.imcdb.org/vehicle_2026023.html

https://www.imcdb.org/vehicle_2026027.html
https://www.imcdb.org/vehicle_2000333-Premier-Padmini.html

https://www.imcdb.org/vehicle_2026028.html
https://www.imcdb.org/vehicle_2000336-Premier-118-NE-1988.html

https://www.imcdb.org/vehicle_2026019.html
https://www.imcdb.org/vehicle_2000270-Bajaj-Tempo-Matador.html

https://www.imcdb.org/vehicle_2026026-Maruti-Suzuki-Swift-DZire-2008.html
https://www.imcdb.org/vehicle_2026024.html

https://www.imcdb.org/vehicle_2000339-Maruti-Suzuki-1000-1990.html
https://www.imcdb.org/vehicle_2000335-Maruti-Suzuki-1000.html
https://www.imcdb.org/vehicle_2000343-Maruti-Suzuki-1000-1990.html

https://www.imcdb.org/vehicle_2000333-Premier-Padmini.html
https://www.imcdb.org/vehicle_2000338-Premier-Padmini.html

https://www.imcdb.org/vehicle_2001750-Mahindra-CJ-3B-1953.html
https://www.imcdb.org/vehicle_2001751-Mahindra-CJ-3B.html

https://www.imcdb.org/vehicle_2023489-Mahindra-Scorpio-2002.html
https://www.imcdb.org/vehicle_2023701-Mahindra-Scorpio.html
https://www.imcdb.org/vehicle_2023704-Mahindra-Scorpio.html

https://www.imcdb.org/vehicle_2023486-Tata-Sumo.html
https://www.imcdb.org/vehicle_2023491-Tata-Sumo.html

https://www.imcdb.org/vehicle_2023492-Tata-Sumo-1994.html
https://www.imcdb.org/vehicle_2023698.html

https://www.imcdb.org/vehicle_337271-Chevrolet-Chevy-Van-G-30-1978.html
https://www.imcdb.org/vehicle_2024585.html

Same Car:
https://www.imcdb.org/vehicle_2023361-Renault-M%C3%A9gane-Sc%C3%A9nic-J64-1999.html
https://www.imcdb.org/vehicle_2023335.html