chou vert et vert chou

two things presented as different but actually the same

A Belgian way of saying it's much of a muchness. Just flipping the word order to show there's no real difference.

Qu'on l'appelle plan B ou solution alternative, c'est chou vert et vert chou.

Whether you call it plan B or an alternative solution, it comes down to the same thing.

Origin uncertain.