Nah, I don't think New looks like Num. Khun Grai is suppose to be very Thai looking, very manly, mature, sweet, caring yet honourable and heroic and none of those qualities applies to New. A guy who curls his eyelashes and applies liquid eyeliner as the beloved Khun Grai? No thank you na ka lol.
It all depends on when exactly they're going to open production for this one. If it's not until later in the year then that likely increases the chances of him being in here. You know how sometimes Channel 7 loves to give us a big surprise by casting someone we least expect so I'm just gonna prepare myself beforehand haha.