No, that is what is changing. For example, I'll be able to build a TR8 out of a 1978 TR8 Coupe so long as I can prove that the chassis I am using is the same as a 1980.

So, Jake's point is that if a 88 body is the same as a 94, then you can use teh 88 body to build the 94 car using the 94 specs and parts.