single speed to vs speed conversion

hello, i have 2 almost new sta rite 1hp maxepro pumps. one for cleaning system and one for filtration. i would like to change motors to VS. do i do just the filter pump motor or both. i have popup cleaning system. which motor do i use ?

I would just put the VS motor on the Max-E-Pro pump for filtering. It wouldn’t be worth it to put a VS motor on the pump for the popup heads since that system needs a higher flow rate.

The VS motor would be model ECM16SQU.