It's fairly common to hear both expressions you mentioned here in the U.S., if that helps. As far as being a tag/label, in the examples you have provided, a ticket symbolizes (to me) something purchased that enables one to go somewhere or do something, like a movie ticket or an airplane ticket, a la the Beatles' song She's Got a Ticket to Ride. A tag or label mean something different to me, they give me information about price or something else regarding that item.
Hope that answers your question,
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