Considering how bright yellow his face is and how green his body is, I would say he's a goldenface. Goldenface and yellowface budgies are actually blue budgies with yellow that spreads into the body colours from the face. The degree of spreading is often slightly different depending in the individual and whether they have one or two factors, so it's not too strange to see a blotchy bird.
Colours sometimes even out more after the first molt as well. I hope I helped, good luck!