Soil albedo for natural vegetated landunits is controlled by soil color and soil moisture (2.3. Surface Albedos — ctsm release-clm5.0 documentation). You are looking in the right module for that. Albedo for natural vegetated landunits will also be a function of the vegetation itself which is primarily controlled by leaf optical properties (2.3. Surface Albedos — ctsm release-clm5.0 documentation).
If you want to understand the differences in albedo, you could calculate albedo from your two simulations (FSR/FSDS: reflected over incoming solar radiation) and difference them.
If you want to understand the differences in albedo, you could calculate albedo from your two simulations (FSR/FSDS: reflected over incoming solar radiation) and difference them.