I have calculated cost distance using a raster unrelated to path distance (a heat index) but would like to also measure the true path distance of those 'routes.' Is there a way to calculate such? If I simply calculate path distance, the tool obviously takes different paths than that used for cost distance. I'm using ArcMap.
I took @FelixIP's suggestion and converted the backlink raster (from the cost distance tool) to flow direction using the formula Int(Power(2,"backlink"-1)) in raster calculator. I then used the flow direction raster as input for the flow length tool. This created a raster of true distance values corresponding to my cost distance raster.