All these meds are quite different from one another, so nobody can predict what will happen. You will probably have more side effects from Paxil, or at least that's Lexapro's claim to fame. I certainly had fewer on Lexapro than Paxil. But since you're on a sub-therapeutic dose of each you shouldn't notice anything one way or the other.
I'm doing the same thing from zoloft to luvox and my anxiety is worse and I'm easilt angered