After having identified our clan 'source' I recently discovered that our family name (a sept of the source clan) has had a tartan registered (and is quite a difference from the source clan's tartan - even the primary colors). However, I have not seen a crest, badge of any other device supporting that latter tartan (the family/sept tartan) so I am preferring to use the source tartan rather than the sept tartan. Is there any basis for using the sept's tartan along with the source clan's crest, badge and kilt pin?

And pardon my ignorance, I am still a newbie here.