The crank arms bolt onto either end, so you can easily swap them onto any bike as long as you have the spare axle to fit your other ride.
The design of these spindles allows unto 2mm of installation adjustment and adjust the width without using a wave washer or similar gadget. meaning it doesn’t require any wave washer or other mechanism to accommodate frame intolerances…just tighten them down until they’re providing the right amount of preload or lose any slop and you’re good to go. (Just don’t over tighten them!)