well.. all gx and true clone cams are interchangeable.
but with 212 enignes?.. IDK.
Rato changed a bit or two, some parts are closer to Kohler engines, others resemble Subaru'esque appearance IMO..
maybe it's as little as the ID of the bearing, or the alignment dot being on the wrong tooth to be perfectly interchangeable,
but maybe the gear is just the wrong size (or toothprofile)
maybe the cam lobes are spaced differently on Hemis to allow for larger valves
(to me it looks as if the Hemi indeed has the valves spaced slightly further apart than a nin-hemi.. but since I only have pictures for rato/predator engines.. I can't tell for sure)
So if the descriptions says "does not fit..."
You should be fairly sure "it will NOT FIT!"
since frankly I doubt a mfg would exclude a popular engine for no reason.
'sid