But what if I attempt to convert my Center to a SF? Will the potential be recalculated from a Center's to a SF's once the position changes?
In general, there is in a multi-skilled way a cap on how good a player can become. That limit does not depend upon position; if you really wanted to take a 7'3" player and make him into a guard, he'd still have the same potential and the same cap, just that it would take effect on his guard skills instead of his center skills.
Guards get their cap divided over 6 skills and Centers over 4 skills. Which means a center with the same potential as a guard can always train to a higher lever than the guard. This is obviously unfair to the guard trainers.