lmckenzie :

Can't say a lot about V1,V2 days wasn't around much.
Same concept applys for Generation 3 as Generation 4

Generation 4 ,One unimesh mesh
Even thou M4,V4,A4,S4 etc etc had the same unimesh mesh.
They where section off differently.
So V4,A4 was the same unimesh but different characters.
V4's cloths did not work for A4.

Not sure about this but V4,A4 rigs was probably a bit different also.

DAZ went all out for Generation 5 "Genesis" thou.
They all have the same sections n rigs so cloths work for all.

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