Yes, there is a gen 4 G21. Since the backstraps are interchangeable, the size can be made identical to an SF. Gen 3 mags interchange as long as the mag release is set up on the left side for right handed shooters.
On a side note the gen 4 G20 just came out. The G21 gen 4 has been out for over a year or so IIRC.
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