I would say the Rebel Yells would sound brighter than they do now if you swap them to the Epi. Might be what you're after, might not?
Yes, as Twinfan once reminded me ( and was correct) - a set of pickups that can sound bright in a maple top Les Paul, can sound darker in an all mahogany guitar. In my case the pickups where different ( Stormy Mondays ) - but the all mahogany guitar they went into was a slim Gibson S.G. I mention this , because if you compare the body thickness / weight of the two, you would
swear that the Les Paul would 'dampen' things down a lot more than a mere 'slip' of an S.G.
If you do decide to have a swap around and listen, ( which I recommend ) - take comfort in knowing that I had to do the same operation / comparison four times with my 335 copy ; - and that involved all that ' keyhole surgery' through the '
f' shaped body holes !
In the end each pickup ended up in the ideal guitar.With B.K.P. it really is worth the effort required to truly know which pickups are best suited to what guitar for your own tastes. After that you have the rest of your life to enjoy the end result. :)