It simply makes sense that runners burn more calories than walkers. All that sweating and huffing and puffing must count for something. Looking at the science, there is a difference in calories burned per mile or kilometer for walking versus running. But the spread isn’t very large, and there is no difference at higher walking speeds. You can use calories burned while exercising to estimate your burn.

Source: Does Running Burn More Calories Than Walking? – VerWellfit