As memory serves me, the 22.5" rim interchanges perfectly with the 20" split rim. I believe available widths are 6.5" and 7.25" and the one you need will depend on what size tires you plan to run. For 11R22.5 or "Lo-Pro" 22.5, I would find the 7.25" wide rims.
I would not run the 20 and 22.5 rims together as the tire sizes may not match perfectly (and at least in the commercial realm, isn't legal either).
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