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I'm not going to be much help, I think, but I'll share...I've had a few maple neck PRSes. One was a bolt-on SAS, so let's not count that, since it's set neck info you're after.
Of the set necks, two were CU22 Soapbars, one with a maple fingerboard, one with IRW. Both had mahogany backs and maple tops. The new McCarty is the only other. The McCarty has a maple neck with Braz fretboard. All of them have been 25 inch scale length.
Here's where I'm not much help: there wasn't one I didn't think was cool.
Unplugged, in terms of sparkle and snap, the Braz fretboard on the McCarty sounds closer to the maple/maple CU22 Soapy than the maple/IRW Soapy. But it's still different from maple/maple, and I like it better.
The IRW CU22 Soapy was a little mellower.
The only other thing I know was that Jack Gretz spec'd the maple on the McCarty as "dead quartersawn." I'm not sure whether that's important, or even whether that's how it's always done. But that was the spec on my McCarty, and the only reason I know that is because it was on the spec sheet.
In retrospect, I would have preferred a gloss neck to the satin neck mine came with. However, it wasn't available that way for this order, so it wasn't an option. And I didn't know that would be the case until I received the guitar.
As a general rule I still prefer a mahogany neck to maple; however, there's a reason for this. It's because I generally play with at least some hair, and often with a little gain, especially on the bridge pickup. So the warmer 'hog neck seems to suit those tones more, to my ear. The more gain, the less bright I want the guitar to be.
However -- here's where the maple neck really shines -- I prefer the maple neck with a clean amp. This is especially the case with the neck pickup, but also there are times when it's great to get a crisp, almost Tele-like, tone from a clean amp. Again, the maple neck is perfect for this. The clarity is outstanding.
But also, I wanted something that would sound different from what I already had. And this one does. I do think the 58/15s are a superb match for the maple neck, by the way.
I hope this helps.