Stay away from a P 100! It's not even close to a P 90 except in appearance.
I have an ES 135 that came stock with P 100s and it always sounded lame and the tone compressed somewhat and lacked dynamics. I swapped them for Gibson P 90s and there was everything I was missing: dynamics, grit and responsiveness. AFAK the winds on the bobbins of a P 100 is different (number of turns of both coils combined) and if I'm not mistaken, P 100s have a ceramic magnet which to me makes a big difference.