Let me try to expand what I think OP is asking, and then try to provide an answer...
There are several manufacturers of Tow Bars. Let's call it three, named BlueOx, Demco, and RoadMaster. These three also offer Base Plates. I own a BlueOx Tow Bar. Do I have to install a BlueOx Base Plate, or could I also use a Demco or a RoadMaster?
IF that's the question, you can often mix brands. Some tow bar manufacturers like Night Shift Auto (Ready Brute and Ready Brute Elite tow bar brands) offer their bars with a choice of connectors. RoadMaster offers some adapters to other brands.
In some brands, it's possible that a Brand A tow bar bought used, is equipped with Brand B connectors.
In an ideal world, I'd suggest working backwards, though. For my given toad, which Base Plate setup do I like best? Can be determined by looking up the exact model base plate, then studying the Installation Instructions. This works even if you aren't going to DIY the installation. Will tell you how invasive the job is, AND what it'll look like when complete. This will tell you the height your tow bar has to match up to, within 3-4-inches of level. Then shop the tow bar.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB