Does Working as a Mover Help Build Strength?

Hi everyone, I am new here and I recently started working out and I also work with a moving company, and some days we have to carry heavy boxes and furniture for many hours. After work I sometimes feel like I already did a full workout. I still go to the gym, but on busy moving days my body gets tired very fast. Does this type of physical work actually help build strength, or is gym training completely different? Anyone here doing a physical job and still working out regularly?