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RosaMarie · 46-50, F
Sweat consists primarily of water (90% by volume), with 1-3% salt and 0.5-2% urea. Your sweat also contains glycerol, ammonia, lactic acid and other trace elements. In contrast, urine consists primarily of water (95-96% by volume), with 2-7% salt, 1.8% urea and 0.3% uric acid.
This tells me that while they are similar, sweat has more components and urine had uric acid.