Making orangutan jokes about Trump isn't the same at all. For starters you're mocking his choice to be an orange man to begin with, nobody made him be orange nor is he genetically orange. And when he's literally displaying the intelligence or at least verbal intelligence of one it's more of just an insult calling him as an individual dumb.
Comparing black people to monkeys/apes has historic connotations behind it to dehumanize and berate the entire race. Nobody is trying to dehumanize Trump by saying that, they're just saying he chooses to look stupid and is an actual legitimate idiot. Not mocking him because of his race or because they simply disagree but can understand his point of view is just different.
When you have a man who looks dumb as shit by choice, and contradicts himself every other day, it's easy to call them stupid and it mean nothing but you're calling that person stupid, having no racial connotations or anything. And even then it's mostly other white people saying it about another white man, while comparing black people to apes has been almost exclusively done by non black people to dehumanize them or compare them to animals both physically and intellectually based on nothing but race.