Every cartridge has its own unique header.
So as long as you're the only one to access that cartridge, it'll be a private header. (So long as you actually injected it into your template file
)
Like I suggested before, you can check your backed up save / cartridges header using either Gateway Rom patcher (rom) or HxD (Sav file) to see its header.
You can then open the Template file with notepad & the header should be at the top of each game.
You can also compare the stock Template to the one you've modified with your Template editor of choice.