Changing Text or Graphics on Other WooCommerce Variant Products

I have a product with three variants: color, size, and type (front and back of the T-shirt).

When I change the text on one product and confirm it by clicking "Done," FPD adds it to the cart. However, I want the customer to be able to select a different size and add it to the cart as well—without having to redesign it again. It doesn't make sense to design each size separately.

I have added the same product ID# to each variant.

How can I achieve synchronization of the same graphic or text between WooCommerce products?