Thanks y'all, this helps answer my questions. I didn't think it really mattered, but would like to know more info just so I can understand the difference and how to identify. I'd like to try to understand so I can figure out what kind (or kinds of) pig Queso is (just for fun). But, it's not a personal concern since I just want to adopt another rescue. I was worried it might not look good for competitions, which would really suck. I'd love to make little outfits for Queso, not all the time but sometimes. My mom dresses her dog up (especially for the cold months) and she loves it. I don't think Queso would mind at all, since he's a very brave kind of pig. Plus, the outfits I would make would not be restrictive (mostly like a little cape or hat). And the livestock/rodeo competition is mostly with teenagers, it's small (I think). I wouldn't intentionally put Queso in a stressful situation. But, if I see any of this causing him stress, I'd stop right away. He's already been through so much, I just want his brave little soul to be happy. (nods) I'll definitely give all this some rethinking based on y'alls posts.
The forum also supports fun piggy shows run by rescues where they don't differentiate between breeds or mixed types. The problem with organised shows is that it creates an elitism between guinea pigs which goes against forums ethos. The same can be said with regard to the dressing up of guinea pigs as it is felt here on the forum that this does not benefit the piggy and whilst many say it doesn't cause them any discomfort or harm we are sure it can cause undue stress to the animal. 
With everything @LisaAli has said above as well as @tabelmabel , @annaa and @PiggyOwner. 
