In article ,
says...

OH OH I forgot the Skylab! Now would that count as a different rocket?
If so, that would put LC-39A at 4 and tied with LC-39B until SLS.

Not in my opinion. Skylab launch was done on a two stage Saturn V.
Yes, there were minor differences between it and the three stage Saturn
V flights. But, there were minor differences throughout the Saturn V
program. It flew very few times, so they were tweaking things on pretty
much every flight.

Model maker websites do a good job of documenting the visible changes,
like the small small rockets used to separate stages and provide thrust
for settling propellants.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer