I do believe the PH bed is a little longer on the EB. I think the best way is to look at the detailed plans and measurements on the SMB site. In the end, it doesnt reall ymatter since they will make the bed whatever length you want, mine as case in point as its 3 parts (instead of the normal 2) and is roughly 80+ inches long.
Now show the opposite. I do think the back of the PH has more room so the bed is a little longer. Maybe I'm wrong but it does seem like I have more room between the back of the rear window and the rear panel...?  actually there is more room between the windows or so it appears.
Opps, I also see I added this post to the wrong topic...Jage you fooled me with that dup picture
2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer