neuroanatomist said:
They'll work, the N designation is just changes in safety circuitry to comply with Japanese regulations. I suspect even the charger is the same in this case.
I assume that there are similar changes to the LP-E4N
http://www.learn.usa.canon.com/resources/articles/2013/lp-e4n_battery_pack.shtml
What’s new in the LP-E4N?
Aside from the gold-colored labeling, there are two fundamental differences to be aware of:
• Higher battery capacity
The new LP-E4N is rated at 2450 mAh, vs. 2300 mAh for the LP-E4 pack. In spite of this difference, it remains compatible with the EOS-1D Mark III, Mark IV, and the EOS-1Ds Mark III (as explained below)
• Compatible with new Japanese safety regulations for Lithium-Ion rechargeable batteries
Some minor changes have been made in the interest of safety, to conform with the latest laws in Japan for rechargeable Lithium-Ion battery packs