Ok I think I get it now.
If I use the patch folder then the person who wants to play my module will need to have their patch folder set up to match mine? Which will effect other games they play as well.
However if I use module CC Tab then it will just use the haks in their hak folder and they can still have what files they want in their patch folder. So they can use their own overrides if they so wish as well.
Or
Will it still work if they just have the haks in there hak folder, but when they try to log into the module it will not tell them what they are missing?