The Swiss 1911 is reputed to have less strength than the K 31. Either will manage Swiss service ammo, but for the 1911, its the top end of its safety level.
There are minor differences and I don't have the right book handy to detail them, sorry. I have some shooting experience with the K 31, and swiss ammo, which is match grade perfromance, although that stuff is scarce today. Very accurate. Relatively mild recoil for the class of cartridge, as the rifle is not light. Felt a bit odd to work the straight pull, and it ejects out the "wrong" side!
Trigger pull was good for a military rifle of the period, and the stock fir me well enough, although I found the wrist too thick for real comfort.