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I can look through it just fine - what I mean is that I cant look through both models to compare.
Im trying to figure out which one I have.
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Gotcha, like said by others, I also assumed you are thinking of purchasing a unit you may not have direct access to.
Is it green or blue? Either way, that tells you only the phosphor used, but will not give you any more details about what the tube actually is. Even to the point that if it's made by a US company or EU / Russia.
If you want to know more details you need to peek at the tube outer rim labels / markings. Easy peasy just look into the eyepiece in an angle, or take photos assisted with a flashlight to get proper focus. Then post the info, whatever it may be, gravings, labels, color of the tube, etc, and surely people will be able to assist. In some cases you can tell much about the tube - in some cases not that much.