[Smush Pro] Smushing Photos Question

Good Day. This website is currently using a plugin called re-smush.it. It is slower than molasses!

The question is should I revert all the smushed images to the original images prior to installing WPMUDEV Smushpro on the website? there are 6,895 images in the library so no idea how long hats going to take.

Any other suggestions you can make prior to me moving in this direction, be great if the already smushed images would work with SmushPro, could you find out?

A backup was completed last night.