Magento 2.3+ Module

We need a related products module to magento 2 and it should work on magento 2.X. Today we have a site called [login to view URL] where we have a related products module. See video [login to view URL] . The module are using 2 attributes to find related products. Malnr and template nr. If any of this attribute malnr or templatenr are the same in any other products they should be shown as related products. As you see in the video, when changing malnr/templatenr related products are changing as well. We are building a new site on Magento site [login to view URL] (develop site) and we need to have this function in our new site. This is the same product on the new site [login to view URL] . This is a combination product as you can see se and use [login to view URL] and templatenr the same way. So in Magento every "products" are not visible but they have attributes We have tested with Related products plugin from Aheadworks and Amasty but the modules are not working on configurable products. It must show the related products when you choose the [login to view URL] / template nr attribute so the customer know which accessories will fit his/her boat. You can choose to build a new module and/or make modification on Amasty module. We need in the backend be able to choose which attribute to use