Not being a Expert on 911s, from reading between the 911l, 911s and 911T as road cars there'd be some spec changes (wheels, trim and options) the engines where very similar just slightly different tweaks. I think 911T was base model (lightest), then the S and the L was more luxury for 1968.
Although I also read the T replaced the L? So confused.
I assume all have the same 2.0l engine before 1970 where the larger spec engines became available?
Yes the R would need some more body work changes and scratch building