I was perusing the old archives at AGES Arcanum and came across a interview with Mike McCarthy in which the question was asked: I thought I checked here before about loading old characters into new mods, but maybe I just checked if you could load a character from one mod into the main Arcanum game. I don't remember. But I've always been wondering this.
He's talking about the pre-generated characters you find in the start-up. And you cannot take a PC from Arcanum to a mod or vice-versa. You can only replicate it.