It is rare that I would have two of the same gun, but I have found myself in that very situation with some guns that I like so much I bought a second.
1. SIG P225
2. S&W P&R 3" Mod 65
3. S&W Mod 41
4. High Standard Victor 5" Hamden
5. Soon to add a second Rohrbaugh
Those I have two identical guns, same size, same caliber. I have the entire series of 40 cal Glocks (22, 23, 24, 27, 35), Steyr M (but one is 9 the other 40), SIG P226, P220, P229, and the Sport versions of each, S&W J-frames, K-frames, and N-frames, but none of those really count and since we are in the handgun forum I won't mention my five Remington 870's.