Thanks for the clarification. I think right angled ones are also referred to as "type A" riser. For example:Yes, you will just screw in the two standoffs in the other position (dual slot ones are fixed but they don't interfere).
I'm not sure for the other risers, maybe there are some with same spacing. Just keep in mind that this riser is right angled.
If you have the drawing for another riser you can forward it and I will check the compatibility.