The "Navi" ball used in the LE is the same lighter ceramic style ball as the one used in TZ. The game does recognize when it is put into the trough, as it starts "Navi scoring", which I think is 2X. The most interesting aspect to me is when you get a good multi-ball going and you have both the normal steel balls and the ceramic ball going at the same time. It really messes with you (in a good way)...
Later,
EV