You are correct. Niteshades is by VHT and Shadow Chrome is Dupli-color. Both are companies of Sherwin Williams (they have like 30 companies).
Nite shades is a translucent black while Shadow Chrome is a 2-can kit containing the tinted base coat and a clear coat. I have used them both and the nite shades seems to be a little darker formula. I am pretty sure that nite shades is a lacquer and shadow is an enamel. enamel will typically hold up better chemicals, abuse etc... probably why they market shadow for wheels mostly... But you could clear coat the nite shades and it would probably do just as well when used on chrome trim. The key is proper prep.
