In a fair fight I see Sanchez pulling away by controlling the tempo with his fast feet and hands and greater punch volume and accuracy.
Sanchez is way better than Pep overall, this is going to hurt feelings but his overall skillset is better. He's also faster, much stronger, better infighter, better defense on the inside. All the strengths Saddler had against Pep, won't exist against Sanchez and he'll be in against a far superior boxer Sanchez wide decision, maybe a late stoppage
FOTC Sandler is at times breathtaking in his punching power, leaving a huge swelling welt on Sanchez's eye with doctors in the middle rounds having to check it closely. But Sanchez for the most part just does what he does so well: remain amazingly cool and poised while ducking, side-stepping Sandy's supernatural punches. If it went 12 Sanchez by a strong UD. 15 rounds and Saddler gets stopped round 13.