So, Rafiki's lion in Paintings and Predictions:
RAFIKI: That is not Kion. It's Nala's father, Kion's grandfather, when he was a cub.
Obviously it doesn't specify if it Nala's side grandfather, so one could take that in context as meaning his grandfather Mufasa, not the other (if he even has an other)… And we clearly can see the painting has red mane and tail tuft.
And honestly, so far he's the only other canon lion with red mane…
(as obviously, it can't be Simba or Kion )