Good question. That's not a common thing to be replaced here. I believe there's only one type of floor flange, so it should mount if you have the space. I think the water connection fittings are common as well, but I don't know for sure.
Your original toilet is a Thetford Aqua Magic IV. If you want to stick with the same brand, you could also replace it with an AM V for an almost direct replacement, or look into an AM Style II or Aria if you'd prefer a china bowl. There are dimensions on Thetford's website to help you determine what will fit.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR