Sadly, that seems to be a knockoff version (I only sell the game "officially" on green cartridges). However, seeing as The Retro Room Games shop is currently sold out, I can only hope there's a working version of the ROM included on that cart. If you did order from The Retro Room, then perhaps they failed to inform me that they switched to grey.
Whatever the case, I hope you enjoy the game! I'm actually in the process of producing physical versions of Batty 1 and 2 myself to sell on the official Batty Zabella website. Those should hopefully be available this month or next.
I actually found it on Etsy while searching for Pokemon romhacks and picked it up on an impulse buy from a shop that had one copy and is now closed, lol. I hadn't yet found the legitimate shops for stuff like this, but now I know what to look for 👍 the ROM seems to work well so far, though I've been working and haven't had a chance to get far. I'll be back here when I get paid because gameboy dev is my new special interest and I want to support the community, and I'll definitely keep an eye out for the official carts!