Two piece vs. One piece bells
 

I play trumpet for my schools jazz band, and I got a Yamaha 5335GSIIAL. It is a two piece bell, and all the other professional horns are one piece. Is there a difference in the tone? I want to know because my band teacher is a stickler on trumpets. He wants them all to be the same models (Yamaha Xeno or a Bach). I just need a little bit of feedback on this. Thanks!