Did some google research on this question. Seems like you may have this reversed. Turns out LS had contracts with Fiat who bought NH. And those contracts survive today. NH supplies LS with large cab tractors in S. Korea and the east rebadged as LS. While LS was suppling NW with a small line of tractors badged as NH in America and the EU. Turns out LS may not be happy with NH supplied cab tractors in S. Korea and the east where they are a popular and respected brand and the NH supplied cab tractors may not be up to LS standards. The larger LS tractors use Iveco diesels so there is relationship and technology exchange going on between the NH and LS.
HS