I have an N Scale 4-8-4 northern (Overland scheme - Union Pacific 806), I want to do with Another double-header steam locomotive. Can I replace the cow catcher 4-8-4, by the 2-6-2 / 0-6-0 cow catcher Using rapido couplers?..... will it take additional??

cow catcher Northern 4-8-4:

http://estore.bachmanntrains.com/index.php?main_page=popup_image&pID=366

cow catcher 2-6-2 / 0-6-0:

http://estore.bachmanntrains.com/index.php?main_page=popup_image&pID=315