WooCommerce products linked by variation plugin allows you to link similar products by variation. You can create multiple rules to make groups and separate groups of the linked products. You can edit the rules and can delete them. You can link products from attributes such as colors, size, brand and etc. You can link a product to a specific variation and can link to all variations. It allows you to redirect your customer from the variation product to the linked-product page. You can link to multiple products and categories. 

Woocommerce products linked by variation allow you to blur the out-of-stock product. 

This plugin also offers you to customize the variation button colors including borders, backgrounds, and text.

Vie documentation here:  https://woocommerce.com/document/products-linked-by-variations-for-woocommerce/