440 piston ring question

Yes, I have used the rings listed as 460 Ford for a 0.040" over 440, simply because 0.040" over 440 is not as common, as say 0.030" over, and the 460 marketed rings are much more available. Another example from my experience decades ago when I raced 426w motors was the overlap between BB Chevy rings.

It's all about the specification dimensions. That said, different brands of rings and ring tension variations can result differing "radial dimensions" that will work as long as the rest of specs match.