Probably as long as fuel economy and engine life aren't a great concern, too big can't hurt too much. We put "too big" injectors in our 2002 Vette, and it runs fine other than makes your eyes water if you stand near the exhaust idling, and 10% drop in range.
Liquids don't burn, only gases do. The smaller the droplets, the faster it changes over to gas state, and the less likely it is to wet the walls.
There are a number of tuners of late model gas engines who always recommend putting in bigger injectors no matter what. I think it's the "one less thing to go wrong" philosophy; if the engine goes lean, it wasn't because the injectors couldn't keep up.