'99 Forester ECU - Can I run an '04 WRX fuel pump and NOT throw a code?

I've got an n/a 2.5 sohc I plan on running in a '97 legacy with a '99 forester ECU. Picked up an '04 wrx pump, but I don't want to install it if it'll throw a code. Soo.. will it throw a code if I run it?

Would I need to pick up a fuel pump controller?

Thanks in advance.