It's worth to say that the AV-8B is the second generation Harrier, while Gr.1/Gr.3 are first gen. The first gen Harriers have been criticised for its cramped cockpit, with anachronic and completely anti-ergonomic instrument layouts, etc. One of the goals of the AV-8B Harrier II project was to address these issues. So, being mainly a McDonnell Douglas project, it has an interesting resemblance to the F/A-18 with its MFDs position and layout, HUD simbology etc. As I'm getting very familiarized with the first gen Harrier procedures now, I'll take a look later for AV-8B procedures and compare, although even at this point I can say that the AV-8B should make the pilot's life easier (was one of its project goals!) as opposite of the first gen Harriers.