Vic - You can't run a Saginaw pump on these trucks w/o getting the right brackets. And the best source for those is on the E-series vans, which did run the Saginaws.
As for this being the same pump, yes. But it may be slight different in the accessories. For instance, I note that the return for this one points down at ~6:00 where one of mine points at about 10:00 and another points at about 8:00. That is all application-dependent.
And, there are differences in the pressure valve included, and that's something I have no way to quantify. But I can say that those who have swapped a Sag from an E-series van into these trucks have found them to work quite well.
What are the differences? One is a quieter pump - where the C-II that comes on the F-Series trucks growls and whines, the Saginaws are quiet. Another is that the Sags don't puke fluid if you turn the wheels with the engine off. But maybe best, they are said to give a better "feel" to the steering.
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI