Cost distance of one raster using routes of separate cost distance in QGIS

Is there a way, using QGIS, I can calculate the accumulated for one raster of cost values but instead of using the least cost distances from that raster, using the routes/paths determined from a separate cost raster?

For instance, say I have a cost raster for energy expenditure based on slope but I want energy costs taking the least cost distances for another raster such as the vegetation density. The product would essentially be the sum of said energy values but while walking through the thinner vegetation if possible.

I need this for an entire surface rather than a path.