I did the same method for the collection for the single games and couldn't get it to work.There are individual versions of all 3 games on the eShop and those can be injected and used separately from Tribute set.
All of which have different Game IDs. I'm currently testing more games as we speak going this route. (Having Tribute Set and the 3 individual NSPs all installed simultaneously)
Furthermore with the individual NSPs, they don't have a main menu like tribute does, so once you load the NSP from your home screen, it'll autoboot into the injected game! Optionally, Replace the NSP Icon, edit the title name, and you'll have a custom game even! (Now if someone can figure out how to get new borders in as well as I have no idea how)
Title ID > romfs > game.bin+renamed cue file
But it never works. Only the collection will work for me.