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They are the same size. Although as far as holsters go, there can be some issues, the G20 and G21 fit the same holster, but the G21sf will sometimes not fit in the same holsters since it has an ambi mag release, but as far as I know, none of the G20sf have that release, so they all fit fine.
 
Is the G20 the 10mm? If it is, and neither of the guns in question are designated as a slim frame, they should be (exterior) dimensionally the same.
I recall researching that the G21 uses the 10mm frame, which is the largest (aside from the target/competition guns) frame Glock makes. :s0155:
 

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