I got the instructions for the new nostalgic pet, I'm just a bit hazy on one thing. Do I need to change the pet I want to use it on to that species or do the instructions cover that also?

I know I used instructions on another pet but I have a sneaky feeling I changed their species before hand but not sure if it was even needed.

Thanks

No you don't need to change it. Just make sure to make the one you want to change the active pet.