You are correct; this is Paraphysa scrofa. The coloration isn't the giveaway here, but the shape of the mirror patch IS. In Paraphysa species, the mirror patch has a distinctive hourglass shape, where in G. rosea, it has no real defined shape at all. Your spider has that hourglass-shaped mirror patch.
I dont think its a scrofa at all. It is a red phase G. rosea. I have one and she is great, just moulted, and she was only 15$. They are not easy to find, hence why alot of people make the mistake of calling them scrofa. Marshal in his book, points out that there are variations in color of rosehairs, as do the Smiths' in their Guide. I thought mine was a scrofa for a little bit, but with more careful research and not jumping to conclusions I found its a rose hair. Check out Rick Wests site for a better pic. Nice spider!!!
yes looking back over it, i now see the difference.
it's p scrofa for sure. then again if you bought it as WC, it could be paraphysa sp pygmy or any other various form of paraphysa... theres lot's of paraphysa we have yet to discover, let alone classify taxonomically.