If we are talking 90 day currency for the carrage of passengers then yes, I agree; the JAA currency also counts as FAA currency. ie. it doesn't matter which licence you were relying on when making your three landings.
It's a very minor point, but if you want to fly with passengers at night then the FAA requires three night landings in the last 90 days, while JAA only requires one out of the three to be at night.