Cute pick-up!
Of course see what the breeder says, but my first thought would be to assume your new buddy is supposed to be a red phase coastal tiger jag. Red coastals are a variant, with babies starting out reddish brown, sometimes very red. They tend to lose the color as they age, but still have a 'look.' It's more common in some populations than others. The trait is polygenetic, and there are certainly folks breeding for it, and for it to last longer into adulthood.