I think that's a climate thing. When I saw one of this pair last month it looked just like a Lowland Anoa. If you didn't know you'd stroll straight past it.
Thats what I was thinking, it reminds me of comparing Mountain tapirs and Lowland tapirs or Mountain gorillas and Lowland gorillas, I notice a pattern, it seems with mammals that have a lowland species and a mountain species where the two species are very similar species usually within the same genus, the mountain species is more hairy