What is the difference between diabetes and glycosuria?

Disease vs. symptom. Diabetes is a metabolic disease caused by not producing enough Insulin or developing Insulin resistance. Glycosuria means the presence of glucose in the urine, which occurs either when the glucose levels in the blood are too high (as in diabetes) or when glucose transport mechanism in kidney tubules is congenitally defective(rare condition).
Usually the same. There are rare genetic defects in kidney that puts glucose in urine and no diabetes and a new drug for diabetes that will put glucose in urine to treat diabetes will add to confusion!