Until July 24th, the owner of any of both games can get the other one for half its price, but it looks like the promotion just got bigger: once this promotion ends, the owner of any (or both) eShop titles will have a discount on different VC games for a limited time for the next four weeks, as announced below:
Four weeks of #VirtualConsole #NES discounts ahead for owners of #NESRemix 1 or 2, starting with these 7 on 24/07! pic.twitter.com/ubn5wfjArk
— Nintendo of Europe (@NintendoEurope) July 19, 2014