>>1518342I'm Hungarian, and I've been trying to find this, but I haven't found anything. I suppose most of these souvenirs aren't sold online but around tourist locations. These enamel magnets look cooler than the magnets I found online.
Are you sure a green version of these exists in the first place?
If you're sure, I'd recommend asking this on the askhungary board on Reddit. I've seen several similar questions like this there. They welcome threads in English too.