That depends how closely they've copied the original.
All standard & aftermarket 1911-A1 grips fit the Umarex Colt 1911.
The Umarex Beretta 92 has a different screw spacing on the left to the standard 92 (although I think it may be possible to drill & tap an additional hole at the correct spacing), my KJ Works airsoft beretta 92 takes all standard and aftermarket grips.
The Umarex Smith & Wessons don't take any standard or aftermarket S&W grips.
It really is a case of suck it & see
ATB,
Nick