I dont see any problem in generating two sets of breadcrumbs for the same product. it depends if you are generating URL's based on your catagory tree in the database of the user navigation path which some sites generate it in real time based on user behaviour.
if you wish to keep one then use the category tree breadcrumbs structure becuase you may have speical offers, hot offers, alternative offers etc which would create similar problems. In that scenario also keep BACK Button for users if last visited page was some special offers page.
Hope that makes sense..
Thanks..
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