monstergroups.json mod entries override completely anything with the same name, figured that out the hard way. Stupid goblins… The last to be loaded is the one that will make it into your world.
itemgroups.json has itemgroup->subtype:collection->id’s containing groups and itemgroup-> id’s containing items. Do these get overwritten if you have an identical id in your mod or are the groups/items added to the base games itemgroup entry with the same id?
This is the one I’m really curious about, I’m running a lot of mods and I have yet to see a tank.
vehicle_groups.json. It’s organized similarly to itemgroups, with an id for a group followed by a list of vehicles. Do mods overwrite a identically named id or add to it?