My 3-B radiator is a few inchs taller than my 2-A radiator, I have been told that the 2-A and 3-B are the same height ,do I have some aftermarket radiator,or is the 3-B supposed to be taller ?

I have all three.
They are all right near 18 high from bottom of tank to top of tank
They are right near 20" wide at the core.
The aftermarket for a 3B is nearly the same as the stock Harrison.
The 2A tanks are somewhat square looking shape while the 3B tanks appear more curved.
Can you provide the dimensions and possibly pics of the radiator in question ?

CJ-2A...HARRISON.......CJ-3B...HARRISON........CJ-5... MODINE
17-3/4" OAH.......................19" OAH........................18-1/2" OAH
14" high core......................14" high core................14" high core
19" wide core.....................20" wide core................19" wide core
bottom mount....................10-3/4" high mount.......10-3/4" high mount
13-5/8" wide mount...........21" wide mount.............21" wide mount