Welcome to the Q&A Forum

If the content of the two pages is related, you might also use an internal link (preferably within the content of the page: e.g. "for more information on KEYWORD"). That will help tell Google you consider ABC the more important/relevant. I still would try to find a closely related keyword for the lesser page if you can; the less keyword cannibalization, the better. Liz

If you wanna take it safe, promote both pages and apply the canonical in few weeks if you see that the product page has not managed to over rank the category page. Also note that internal penalisation is only to the newly added page and not to all the website.