And I believe that the answer is, NO, not all 44 hubs are the same. The only difference though, for Ford from between a '71 and a '79 Dana 44 however, would be the fact that some are for drum brakes, others for discs.
So, drum for drum, they're the same. Disc for disc, they're the same. But they don't interchange.
You runnin' discs now?
If you buggered the old ones? Can't you just clean up the splines with a file or something? Is that what the issue is? If your lockouts are not working properly, that's what it sounds like, if you had stock lockouts.
What type of lockout are you running now? Stock Spicer? Aftermarket?
Paul