I doubt they would interchange. Heck, the USP .45 and USP 9/40 didn't interchange! I can't say with certainty, but the dimensions are likely slightly different (as they were on the USP line).
You think YOU got it rough - try finding a LEFTY holster for an HK45.![]()
Easy, with or without a light attached?
As far as the OP is concerned, a well made holster should only fit identical firearms, if it will fit other models (other than a calibre change to an identical gun) it's probably going to suck hugely at it's intended task. (close doesn't count in holsters)
Try Raven Concealment Products, you can have your holster and mag pouches for almost ANY HK in left or right hand and with or without light. These are terrific holsters, I love mine. The only gun that I can think of that they don't list is the Beretta 90-two, but nobody makes holsters for those. Oh yes, and they don't list holsters for "game" guns.