Donkey now appears as dark brown, while Mule has grey coat. Loading same animals in a previous version show the proper coat colours.
Donkey
summon EntityHorse ~ ~0.5 ~ {Type:1,NoAI:true}summon EntityHorse ~ ~0.5 ~ {Type:1,NoAI:true}Mule
summon EntityHorse ~ ~0.5 ~ {Type:2,NoAI:true}summon EntityHorse ~ ~0.5 ~ {Type:2,NoAI:true}
Confirmed. They do not have to be summoned for this to work.