Here are some of the interesting items about VB I found going through the Mopar parts manuals for 727s, service manuals and the Master tech lessons.

In 1966 all the VB were the same part number with same internals regardless of transmission model matched to engine. They used the same plate and aluminum transfer plate. The 2466886 deep channel version.
In 1967 through 70 there are 2 basic VB. The version for LP engines and HP engines. The internals are again all the same inside a year. The only difference is the transfer plate. The HP get the deep channel 2466886, and the LP get the new 2801295 with narrow channel. The plate was the same.
67-68 VB did not have the plastic isolator for the neutral safety switch, the body changes number because a few valves changed.
69-70 VB have the isolator and added a pressure relief ball and spring, body changes again, because of the relief valve, but are otherwise the same as the 67-68 internally

So if the vb is original and has the 2466886 bottom plate it came out of an HP transmission 67-70.

71 is a revision and there is an extra valve, extra springs, and many differences depending on model, engine, transmission. Mix match of plates, and transfer plates. So now, there are several VB part numbers and while you can narrow down what you have by the transfer plate number, there are spring and plate differences that prevent you from knowing exactly what you have. The one thing I am not sure, is the later model 71? and up seem to have a stamped number punched through the plate. Is that meant to be an identifier of the plate? If so that might help narrow down what you have.

By the way, in 71 the accumulator operation seems to have changed. It get line pressure in a different way, has this new valve pressure applied on the side, and the spring location or no spring depending on LP, HP 440, or Hemi/6 pack. But that is another subject.