Joomla! allows to use one template on one page but many different templates could be assigned to meny different pages. Template framework files and scripts should be loaded when template is assigned. So if you display template with Gauntry no T3 framework files should be loaded and vice versa... So I think it is possible and safe...at least in theory, but never tried it :)
Try it yourself, it should not crash your system. You always could disable one of templates...
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