I’d like to clarify two misconceptions that are in this post.
First, there are no plugins are universal in the sense that the code works on both Bukkit/Spigot and Sponge. However, some plugins like LuckPerms or WorldEdit have multiple implementations that will run on different platforms while using a core library that is the same. The truth remains that developers will need to write implementations using the Sponge API if they expect it to work on Sponge.
Without dwelling much on Pore, I’d like to emphasize that it should not be considered stable or reliable - let alone functional in most regards. This is compounded by the fact that there isn’t a recent version anyways, and I doubt you’ll be able to start a server with it on an API 7 server. I strongly suggest you avoid recommending this to someone who may not understand the risks and forces at play here.