This is a problem that arises from time to time with the CZ .22lr mags (and perhaps other calibers of the 452/455 series), though no grinding is required to solve the problem. Simply disassemble the mags and swap the orientation of the spring such that the part of the spring that faced the front or muzzle side of the mag now faces the trigger side. Keep the follower in the original orientation. Works like a charm.
With regards to the mags being hard to insert into the rifle, this is usually due to user error when reassembling the rifle. Before torquing down the screws, insert the magazine and give it a slight jiggle to center the mag well in the stock. Voila! problem solved.
Oh, and to answer the OP's question, all 452 and 455 .22lr mags are interchangeable between 452 and 455 rifles in .22lr, regardless of the material used to manufacture them.
Thanks,
Cal.