There is a size difference, it's a tiny difference but our dosing caps are slightly bigger (more wide&length). They don't rattle in the V3Pro like the others did.The XMax V3 Pro capsules work well, as do the POTV One capsules. They are about the same size but differ slightly in their build. They perform equally well.
I'm glad the dosing caps works well for you, enjoy the V3Pro!