If you meant to compare the P99 to the P22 - the P22 is a much smaller gun. Though in separate pics they look as if they share the same frame, this isn't the case.
The P99 has had 2 different rails, depending on generation. I'm going to defer to a member who has both guns... i've seen accessories that claim to work with both guns, but without hands-on experience i'd be speculating on particulars.
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