In the case of being shocked from a malfunctioning CBM; no, being wet (realistically™) will not make a difference since the CBM is inside you, and you’re probably like 70% water anyway; so a little more on the skin isn’t going to make a difference.
Especially, when you consider the path of the current: where it originated (internals) and where it is heading (earth). The current may not even touch the water on your skin if the resistance from the skin (as an insulating membrane) is higher than that of the internal path to ground or the amplitude of the current.
However, if the electrical current originated from an external source; for example a Shocker Zombie - then the ANBC suit would act like an insulating membrane in real_life®, so your wetness would only have an effect if the current passes through the suit (assuming no holes) - and if the current is strong enough to pass through something as highly insulative as that suit, then again it won’t make much difference because you’d still be ded either way.
I have no idea, whether or not this is modeled in game, I’ll have to test it out and get back to you.