Almost certainly less, at least an inch or so if the recline angle and seats and such are all equal. Now that's with the head restraint flush or nearly flush. Extended beyond the shell, things may be different depending on your vehicle!
We put them both in our BMW330 last weekend and estimated in that car there was a 2-3" difference (now I can't guarantee the install angle was identical.) It was enough to make my husband say the BLVD 70 was a perfect fit. So, at least in that one car it was a very noticeable difference. (DH is 6'4" so it's a big deal to be able to have the seat all of the way back.) This was with the head restraint flush.