Do I need multiple licenses and how do I handle client work?

One of the main things I use Envato Elements for is background music for videos. I have a couple of questions.

  1. What constitutes a project? If I have a 16:9 formated video for widescreen viewing (Youtube/Vimeo,etc) and I also make a very similar 9:16 format (Reels, TikTok, Shorts, etc) do I need to register another project to get a different license for the vertical format? Is there any guidelines on this type of scenario?

  2. I use the work myself to promote my work but the main intent is to deliver to a client to use. Is there anything I need to do differently?