Help with Varios 6-S controller

[I.AngelReef]

Hi i just want to know if i can use the controller of my Varios-6 in my Varios-6S pump, both controllers are 36v and 75W but my skimmer seems like don't have enough power, I try switching them and the power that my skimmer gets with the controller of Varios 6 is way more better than the original one(Varios 6-S), besides the various 6-S controller is no longer showing led lights of power

 

[blaxsun]

Deja vu...