If you practice enough and become accustomed to the mouthpiece, yes you will. Your lips have to get accustomed to the fact they have more room to move now, along with the fact that the Schilke 51D is a very deep mouthpiece which requires a lot more air than your Yamaha 47. Every time you switch to a bigger mouthpiece, your high register will be worse than before the switch but if you keep working on it it will come back.
Euphoniums
2008 Willson 2960TA Celebration
1979 Boosey & Hawkes Sovereign (Round Stamp)
Mouthpiece: Denis Wick SM4
Baritone
1975 Besson New Standard
Mouthpiece: Courtois 10