No.
Sanchez has always had trouble with control, Osuna has not. Walk rates for each in the minors go Sanchez - 4.3, 5.1, 4.2, 5.1 and for Osuna - 3.1, 2.3, 3.3. The sample you're talking about last year was half the amount Osuna has pitched for this year already. And Osuna also has a lower BB/9 and a higher K/9 then Sanchez had last year in relief.
I think you have to assume his numbers drop a little. But it's not unreasonable to expect him to be a good #3 next year in the rotation.