This only means anything at all if you are completely sure that no Pantera from any year would look identical to your Zaskar. I have a Zaskar a few feet away from me, and I can't tell the bloody difference between it and a Pantera from web photos! Unless there is a specific feature you can point to and say "That was never on a Pantera"
I don't you are giving safe advice.
To the OP: Why not just ask the seller if the 6061 stamp is there? If it is, you're safe. If not, you can try getting a model id from the frame number using this
http://bmxmuseum.com/bikes/info/122/
- I emphasize "try" as the guide is for BMXs!