do glock 21 and glock 21sf use the same mags ?

I thought the SF with the ambi release had slightly different retaining notches, and were only backward compatible
 
Not all 21SF magazine releases are the same.

Some are conventional. Some are (were) full-time ambi, kind of like the XD. They required the cut in the front of the magazine.
Gen4mag.jpg
 
All new magazines have all three cuts. Most new pistols don't employ the front cut. The full-time ambi 21SF did.
 
Not all 21SF magazine releases are the same.

Some are conventional. Some are (were) full-time ambi, kind of like the XD. They required the cut in the front of the magazine.
Gen4mag.jpg

Mine, which I believe to be a gen 3.5 G21sf, looks like the one on the right. Only a notch on one side plus the silver part. The middle silver part is the part that holds it in my gun. If I'm wrong, correct me, but earlier models I don't believe had the silver part, just the one side tab.
 
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