Hey @bhavyarao,
If you want to access the images from the Produits collection via the Catégories de Produits CMS collection, you can do so as well. Just place another collection list element inside the product category collection item on the page and add it’s source as the Products (Multi-reference) field and inside this newly created collection, you can add the Image element and you should be able to map it from the Products collection.
I shared a similar approach with screenshots in a different thread, you can check it out to visually check what I mean and probably apply it for your site as well.
Hope this helps.