I think you have to use one or the other.
Its unfortunate if you already made most of your site as xcart will no doubt do much the same as what you made already but is a complete code.
by adjusting the skin files in xcart you would create a site that could look and work the same as what you have and have more features.
you can just add your products to xcart and change the look
If your experienced in php / mysql you wont have problems adjusting the core code to suit your needs.
You can easily add extra pages to xcart too
hth
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