Is cropping from early beta screenshots allowed?

[Ashley and Red]

So, short-long history: I managed to get a game-quality (in other words, it was a native screenshot size of a DS game), and got a sprite from there. Technically this sprite is not used in-game nor it resides in the game data (afaik) but even so, it is a sprite of an unreleased version of the game. Can I post it alongside the other game sprites? Thanks~