Hi, I think that, when you compare your Vase to other glass with depictions of classical Greek scenes, you have to have in mind the Greek prototypes the makers of your piece used as a model. When I look at your Vase, the style reminds me clearly of late classical Greek red-figured vases of the 4th century BC, and I am quite sure that somewhere out there exists a vase with your scene on it, even though I could not find it during quick search I did. The other engraved examples you showed are related to high classical Greek art of the fifth century BC, and that explains also the difrerences ins style of the horses and the riders etc... By the way, most of the "Etruscan" vases that I have seen show motives from greek vases. The term "Etruscan" has to do with the fact that nearly all Greek vases known from the late 18th century on came from Etruscan tombs, and it took quite some time to understand that they actually were imports from Greece, from Athens, to be precise. However, what I try to say is that I think that the style on the "Etruscan" glass vases is related to what the prototype was in each case...
Mat