I can't remember what the formulation of the other potassium was.
Potassium Citrate max dosage allowable in the US is 99 mg
When I looked up the differences (when I still had the other bottle) they were comparable
I can't find my post about it but here is one that says a similar thing
http://www.3fatchicks.com/forum/4676969-post38.html
So the citrate needs fewer mg than the bicarbonate for the same "dosage", basically