1.) Based on the beliefs of some humans, cloning is not ethical. They fear that cloning can cause mental or physical damage to the organism that is cloned, they also believe it to be unethical because animals that are cloned are usually placed in poor living conditions before, during, or after the experimentation.
2.) Again, there is of course a difference scientifically, but ethically, no. The genetic structure of monkeys and humans are quite similar so cloning monkeys lead to advancements in cloning humans but they are still two totally different organisms... When ethics come into play, people would be more quick to say, "If you won't clone humans, then you shouldn't clone a monkey." Or something along those lines.
