Is all Forza 5 cars in Forza 6 as well ? ( including DLC )

Hi everyone ,

I have read that all the cars from FM5 is in FM6 as well. Is this true for DLC packs of FM5 as well ?
I have both FM5 and 6 and want to buy car passes , but don’t want to buy the FM5 car pass if all those cars are in
FM6 and its DLC also. So would it be best to buy only FM6’s car pass ?

Some advice please.

Thank you

Short answer: No

Long answer: According to this list the following cars are available in Forza Motorsport 5 but not in Forza Motorsport 6: