I have different Print-all-over items with the same Pattern/ Design but different Color variations. Each color variant has 4 images (front, back, 2 sides).
Ideally they should be variants of the same product, but I find that Shopify doesn’t allow 4 images per variant.
Unfortunately shopify doesn’t allow us to add more than one image for a single variant. So you need custom coding using image alt method to show all variant images matching the selected variant. Let me know if you need hep with custom coding.