There can be. In a base WooCommerce configuration, variable products only allow one image per variation. However, you can install plugins that allow more than one image per variation. To deal with this situation, simply check the Import additional variation images option at the bottom of the Variations tab in the WooCommerce Add-On section of the import Drag & Drop screen. Note, this option only appears when either of these plugins is installed:
https://woocommerce.com/products/woocommerce-additional-variation-images/
https://wordpress.org/plugins/woo-variation-gallery/