Technically, according to the Qualiteam FAQ regarding X-Cart, you'll need to purchase a license per domain:
http://www.x-cart.com/faq.html#22
Quote:
22. I have several different domain names pointing to the same site. Do I need to purchase several licenses ?
If you have several different domain names pointing to the same site with the same content, 1 license will be enough.
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To clarify further, the bolded part of the "answer" would deal directly with your multidomain product's ability to configure each "store" differently, which means it would not appear to be the same site with the same content.