DKCR/DKCR3D

Does anyone know what the differences are, if any, between the Wii version of Donkey Kong Country Returns and the 3DS version?

I know that it's differents opus.

There's new levels I think.

The 3DS game is splitted like StarFox 64 3D that you owned.

a Original Mode with same difficulty as Wii (3hearts ?)
a 3DS Mode with 3 more hearts.

Also a new world with some new levels but i don't know if the levels are in both difficulty modes