There can be differences in attaching the whole assembly to the bladder, but swapping just the inflator is usually relatively easy.
I had the Genesis version of the Outback for a while before selling it to a co-worker, and I have the Scubapro version of a Rec Wing that I use as a cold water singles wing. Both use a standard 1" diameter corrogated inflator hose, so you should be able to interchange the two inflators.
Some inflators use a small pin to capture a cable for a shoulder dump while others use a larger diameter pin, but most pull dumps have a cable with a loop large enough to accommodate either.