Klonopin-Valium. Able to tell difference?

[jabinme]

If a doc can detect the amount of creatine in a UA does that also mean that he would be able to tell if someone were taking both Klonopin and Valium?

For instance, if someone was prescribed klonopin and took some valium as well would the doc be able to tell that he had been taking the valium? Or just that hes been taking a prescribed benzo?
Keeping in mind that he can tell the amount of creatine in urine, is he also able to see the levels of klonopin and valium? Or just levels of benzo in general? Or just that someone has been taking a prescribed benzo?

If more information is needed please feel free to ask. This feels like an incomplete post, but I'm not sure what else to add.
My thanks in advance to anyone who can explain this a little better.