Like MathSmath wrote, get_template() does not support the re-use of your variables.
But locate_template() infact does no inclusion at all. It just locates a file for inclusion.
So you can make use of include to have this working just like you expect it:
include(locate_template('custom-template-part.php'));
$var from your example can be used in the template part then.
A related question with a more technical explanation of the variable scope and get_template(): Form Submitting Error with get_template_part()
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