Ok, I'm late I know, I agree w/ those saying they are the same, different registeries, yes, but otherwise basically the same. Chances are if you swapped the papers of a solid world champion paint and showed him in an AQHA show against QH, no one would notice.
I'd love to see someone post several examples of QH and Paint and see how many could tell which was which. I know I couldn't and I've owned both forever.
People don't breed Paint to QH to double register, because w/ a Paint in the pedigree it wouldn't be eligable for AQHA. And they don't not breed QH to Paint because of the fear of excessive white, they don't because then it would be a Paint, not a QH.
Now is where it gets confusing, when I say they are the same, I mean mentally and physically, but they do have separate registries so are technically separate breeds. Therefore, I would not call the OP's horse a QH/Arabian, she's Paint/Arabian, but I think technically she'd be Pinto Arabian?
I think Paints are one of the more misunderstood breeds, and being a Paint person, I do have little peeves related to that.
Now for the reason I bothered to post, did anyone else try to look up the sire? Because I couldn't find anything w/ the name and the number took me to a blue roan overo mare?!