How should I reference components of Header apps within H/D apps in logic blocks?

[ian.p]

This screenshot shows two ways of referencing a component of Header app in a H/D:

1. The first involves selecting the H/D app, then Field Location = Header and then referencing the component you’re interested in.
2. The second involves selecting the Header app directly and then referencing the component you’re interested in.

As far as I know both seem to work. Are both supported? Is one preferable to the other?