In general, there is less swelling after implant switching. This, however, is sometimes the problem. Since all implants have a capsule around them and since this capsule is like the inside of a baggie, any fluid (blood or transudate) will sit in this baggie, and not necessarily get absorbed. Therefore, I always put a drain in, bring it out through the axilla (armpit) and leave it in for a couple days.
If there is a capsular contracture or the pocket has to be enlarged for one reason or another, then you can expect a greater degree of swelling.