CarPro Essence is a primer polish. Essence Plus is more of a onestep product that has zero abrasives but does have some protection. Essence Plus with a gloss pad can be used to polish and repair a coating assuming it isn’t too bad.
From the CarPro US product page:
Q. So how is it different?
A. In just about every way!
PLUS contains zero abrasives!
PLUS is extremely hydrophobic!
PLUS is NOT a primer, and Essence is THE primer.
PLUS is made for using on top of a damaged coating (or as another type of service on raw paint).