It's interesting to think that someone pissing all over you has an effect only very slightly different from sweating and letting it dry up, amirite?

All healthy people have the same things in their urine and sweat, just in different concentrations. Very few things are in urine but not in sweat, and those that are occur in minute quantities. Urine is mostly just concentrated sweat. So when sweat dries up, its concentration increases and turns into ~90% of what urine would turn into.