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.
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.