he could possibly also be a 'ambilobe' panther. i have seen many color variations of the ambilobe. see below for 2 sites with info. the diego suarez would be my 2nd guess. on a coloration like this, i'm not sure you will ever be 100% sure. i'd love for my male nosy be to wind up looking like your cham, though. lol. he's great looking.
:What type of panther is this? He fires up to a yellow where the green is when he gets angry. :He was sold to me as a female Nosey Be when he was a baby. Wrong on both counts. Could he be an Ambanja?