I don't think this is the same at all. Creation of good is not necessarily as good as avoidance of harm is bad.
If your goal is "maximize total happiness", then engineering blisshrimp is obviously the winning play. If your goal is "minimize total suffering", than the play is to engineer something that 1. experiences no suffering, 2. is delicious, and 3. outcompetes existing shrimp so we don't have to worry about their suffering anymore.
Ideally we'd engineer something that is in a state of perpetual bliss and wants to be eaten, not unlike the cows in Restaurant at the End of the Universe.
Eh, only if you're minimizing suffering per living being. Not total suffering. Having more happy creatures doesn't cancel out the sad ones. But I see what you mean.
According to this guy it does.