The guns that were/are marketed as SA/DA Hi Powers aren't really Hi Powers at all. They share some similarities, but a true Hi Power is much simpler in design.
Also, the SA/DA "Hi Powers" are much less popular than the actual P35, so parts, accessories, and magazines will be quite a bit harder to find. Heck, it's already kinda tough to find accessories for the P35!
Since these guns are so hard to find, I have no experience with them. Perhaps someone else may be able to shed some light on that particular gun.