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Babble, it sounds like your cats are happy with using the same littler pan now, so I believe that you can make the transition to only one pan if you are sure they are definitely sharing the litterbox.
Some cats are really picky about that, as I had a white Persian that was so upset when another cat used his litter box, that he would to touch it after that. He would use the floor beside the litter box, but would not go in the box. Once the other cat was gone again, I had to completely remove that old litter box, scrub the whole floor with bleach water, and then buy a new litterbox and litter for that cat. Only then would he use the litterbox.
I think if you take away the litterbox that you want to stop using, and then clean the floor really well, spray down the whole area with Odo-Ban, and then put SOMETHING sitting right in the spot where the litterbox was. That way, they can't get to the exact spot, it won't have the right smell anymore, and they will (hopefully) then go and use the other litterbox.
If you can just shut the door to that room for a few days while they are making the transition, that is even better.
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