You can use only one copy of OlliOlli from the newest bundle, and then take advantage of the cross-buy feature to get the other copy, free.
Simply redeem the code on one console, and with the other console your NNID is linked to, you should go to the eShop, go to the OlliOlli page, and it should be $0.00.
Anyone want to give me a spare OlliOlli code?