Well, sure the bubble is going to taste a little more refined. Depends how good a job one does with the dry ice I guess. Just try it. Take your 220 or 190 bag and put it over a small bucket with your dry source and some pellets. Shake for 15-30 seconds (no more!), invert and shake out like a salt shaker onto a very clean hard surface like the kitchen counter or table. I retrieve the larger CO2 pellets if I am doing a lot, but the rest just is dumped.
I also built a press (see my other thread about the Jack Puck I ripped off). It works great, and if I heat the container first I get something close to bubble.