Differences between 92 magnum and 93 on by

NOPE!

92 was the first year of the magnum.

92 Magnum exhaust manifolds have slightly larger outlets. IIRC it's 2 1/8 vs the 93 and up 1 7/8".

That's the only difference I can tell you about, though, although it's a fairly well documented one, even here on FABO.