The profile is not the same, but the prohunter forend will fit the 26" heavy barrel. The 28' Prohunter barrels have a slightly thicker profile than the 26" heavy barrel. The standard forend designed for the 24&26" barrels will not fit the 28" Prohunter barrels.
I bought some gear since and have had a chance to try.
Oddly, the Pro Hunter forend fits both my 24" iron-sighted .30-06, my 26" 7mm Mag and my 28" .30-06 Pro Hunter barrel. How it does this, I'm nonplussed.
Was going to get the regular forend for the 24", but now I can't see the point. After all, if people are free-floating theirs with washers, then even if it doesn't fit (sure LOOKS like it does!!), who cares?
Thanks all!