You're welcome! Thanks for your feedback too!
I just saw there is a .nim with prefab. I tried to edit it using text file editor to update object name with new one, but the 7days editor can't take it. It corrupted the file. So it's not possible to update prefab directly in the data. It seems we don't have choice to edit each prefab from editor.
And oh, I didn't notice the light color didn't update too 😕 I'm gonna need to check it too.
So yea, manual edition in prefab editor seems to be the best way for now.
I don't know if it would be better to wait A20 stable for this. Maybe they will do something for it.