[Drakker]

Some are, the frames are not always the same width though, so you got to beware. The slides are interchangeable, you can put a hi-capa slide on a 1911 and vice versa, though not all parts of the slide from a 1911 slide to a hi-capa slide are (the rear of the slides are different, to accommodate the sights notably, but might also be different at the blowback housing level, some have the rear sight screwed in them, others don't for example).