Because monkey biology is more similar to human biology than mouse biology is, monkeys are more useful for clinical testing. But for good experimental control, it is useful to have genetically identical animals, so any differences can be attributed to the treatment rather than different individual reactions to the treatment. But it's very rare for Rhesus monkeys to produce identical twins. And it is vital to understand that many characteristics are caused by upbringing, and in humans, by one's choices. Therefore Drs Schatten and Strandberg are not acting contrary to Scripture simply because they advocate cloning animals.
Man is now sinful, and the creation is cursed.
Therefore there is always the possibility that research can be abused. So careful checks and balances are required. But this is true of many fields of research, not just cloning and other genetic modification. This would include the medical advances which might be possible with identical monkeys. Humans were never told to have dominion over other humans , nor manipulate them.