If your bow is tuned properly they should both fly to the same spot, unless your are using an arrow spine that your bow cannot be adjusted to.

I shoot the 100 3 blades and my field points, practice blades, and real blades all shoot the same.My bow is only shooting in the 250's with full lenght 2314 xx75's with 5 inch vanes. If your bow is a lot faster it will be a little tougher to get good flight but with some tuneing it can be done.
SF

Sorry I didn't see your post until today. I have found that Muzzy practice blades actually fly just like their thier sharp ones. Muzzys are very accurate broadheads, but the most accurate fixed blade head I have ever shot is the Slick trick broadhead. In some recent testing I have found them to be very accurate, even with straight fletching,and not so perfectly tuned bow. I don't think you will see a differnce between a slick trick and a muzzy if you have a perfectly tuned bow, with plenty of helical fletching, but with straight fletch, or smaller fletchs you will see a differnce, or at least I have. The slick tricks fly more like more like a mechanical than a fixed blade head.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS