Don't worry - I'm new to the games as well, with just as many questions.

I've got a pretty extensive collection of Wipeout graphics, and research through it turned up this answer: it seems to be an early appearance of a Wipeout 3 Auricom logo. It looks quite a bit like just the cap "A" from the spelled-out corporate logo used in 3.

I have the new Mac OS X version of the game, and all the signage has been changed to team logos. There's no Red Bull or music group logos at all, so I know that these graphics can vary depending on the port.

I believe the PC version of the game was ported quite a bit after the PS version came out, so perhaps new tDR material for Wipeout 3 made it into the game at that point. I would think it's possible. Look at it this way: when the Mac version was ported, Wipeout Fusion was already on the market!

Hope this helps,
C.