First of all, all the Winchester 760 and H414 powders I've inspected have been ball powders that have appeared identical to me.
I also contacted Hodgdon via e-mail about the Win. 760/H414 identities and they confirmed that they are the same powder. For further proof, you can also consult the 2007 Hodgdon reloading magazine. You will find that where H414 is listed for a load, they will also list IDENTICAL numbers for Win. 760. In addition, H110 and Winchester 296 are the same powder. If I remember correctly, there is also a Hodgdon powder that is the same as Winchester 748 but I forget what it is. The best thing about this to know is that the Hodgdon versions of the powders are generally a little cheaper than the Winchester versions.
You probably know that Hodgdon distributes all Hodgon, Winchester and IMR brand powders.