Chinook is a bit higher AA% than Northern Brewer. You might want to use just a little bit less. Though it shouldn't be all that big of a deal if you just throw it all in. NB is usally around 7 - 7.5. Chinook is usually around 12.
Brewing Next: Zombie Dust clone, 5 Cent IPA, Russian Imperial Stout w/ bourbon soaked oak chips
Kegged: Robust Porter, Duvel clone