There might be some perception differences to the two words but since we are talking about a contract and not marketing I consider it of no consequence. It is contract verbage, it could be customer, client, signee, whatever at that point, to me it's just to designate who has what responsibilities.
They sign in the location marked purchaser, and any of their responsibilities referr to purchaser in the wording. I don't think it matters what word you use, so long as you are consistant, and they sign in the proper location.
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