I tested both in the current release and beta, doesn't seem to be possible to do so.
It'd be pretty good to be able to compare variables to one another (correct me if I'm wrong about this, but all my experiments yielded no working result.)
I wish to create if statements that check if a variable is greater than an another variable, but this doesn't seem to work at all currently. As such I'm suggesting it to be added to 8.0