They never talked about their music as far as I know. Caleb & Nathan both gave One Direction some sort of ‘advices’ in a SUN interview.
Harry Styles is a big Kings of Leon fan. Nathan & Jared posted various positive comments on their Twitter accounts about Harry.
They got the chance to hang out in the UK a few weeks ago & I guess these last meet ups just show that there’s in fact a little friendship starting to bloom.