They can be interchanged, sort of. The 175 link is flat. The 350 has wider forks than the 175, but the same width hub, so the 350 brake link has an offset bend of about 1/8 inch. You could bend a 175 part to fit the 350 or flatten a 350 part to work on a 175. In either case, you might crack the chrome plating, though, so you might want to get the correct part if possible.