One from picture above:
One in Classic Pack:
There is a difference; correct me if I'm wrong.
The one in the classic pack is the "official" texture, not cut out from a screenshot. The texture in Classic pack is the one from the 12w21a snapshot.
Edit: Ah, I understand what you mean. You know that the Classic pack have the ruby texture, but you're saying there is yet an earlier version of it. Yeah, that is most likely the case, but the only way to get that is to cut it out from the screenshot, so it was actually never used in any release. But I guess you can argue wether or not you should use it.