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Hi Steve,
I don't really know the answer to that and I wouldn't want to speculate when someone else's money is involved. I can give you some information which may help you make a decision.
I have used both eyepieces but at different times and over 10 years ago. I liked them both a lot and they are very high quality eyepieces with excellent transmission, sharpness and contrast. Using them at different times I can't remember exactly how matched in performance they were. All of the focal lengths in both series are excellent. You can also add the Celestron Ultimas and Orion Ultrascopics into the mix, as well as the Meade Series 4000 5 element plossls.
I've never had access to any of the technical data regarding any of the variants so I don't know what the coating / glass type specifications were for each variant. The question is, even if there were, would it matter? I don't know, but I do know that the human eye / brain has an excellent ability to compensate for minor optical variations, like field curvature, so very small differences may not be noticeable at all. These eyepieces were produced over many years and there is just as high a probability that 2 of the same eyepieces from the same series, manufactured at different times, have slight variations in coatings / glass type. Again I don't know if it would matter.
I would certainly be giving it a try as you can always re sell one of these if it doesnt work without losing money as they are sought frequently on the used market. However, all that having been said, notwithstanding that different branded eyepieces worked perfectly well, my CDO (OCD but I also need the letters in order) would have me searching the used eyepiece market so I could match them up.
Cheers
John B
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