Is acesulfame potassium and aspartame the same?

No, Acesulfame K is an artificial sweetener which offers none of the benefits of Vitamin K. The full name for it is "Acesulfame Potassium." The is used to K represents Potassium, to shorten the name.

Some say that this sweetener actually hinders brain development and/or actually causes brain damage. This claim has not been evaluated by the FDA, which some would say is a "convenient" oversight.