Yeah, so it debuted as Ultim@te Race 1 track with PCX1 PowerVR cards (no texture filtering, one long 8km track only).
For the PCX2 PowerVR cards (with texture filtering) they released a 3-track version (there are also some variants like a Gateway one with PC cow branded car!) - I had this with my Videologic Apocalypse 3DX back in the day (as well as WipEout 2097 that got me into futuristic racing games!).
Ultim@te Race Pro is the full Microprose commercially released version, which adds another environment, plus an open world battle multiplayer area and a test oval-like track. Plus car damage and some other tweaks.
Ultima@te Race Rally was to be a sequel, but my video explains what happened.
p.s. my channel covers Every PC F1 Game, Every PC Rally Game, PC Futuristic Racers and Sega Arcade vs PC ports. With a lot more planned, if I live twice as long
p.p.s. I have a PCX2 Matrox M3D PowerVR card, and an Nvidia NV1... but they're both intended for future Sega Arcade vs PC ports videos mostly... I also have all the Ultim@te Race versions thanks to help from Vetz on VOGONS (aka RetroCompaqGuy on YouTube)