When I was younger I used to do at least 50 bee removals every year. This involved removing bees from walls and ceilings mostly. These days I mainly just collect swarms. When we remove wild bee nests there is normally a lot of bee brood.
Drone brood is very easy to see – the cells are larger than worker cells, and the capped brood bulges out like a half peanut from the frames. Worker brood has an orange fluffy capping and drone brood is even more fluffy.
Worker brood is far smaller than drone brood, as mentioned above. These bees hatch and leave a layer of silk behind, meaning that with time, brood cells build up a layer of silk.
Brood is lighter in weight than honey. Brood combs are also warmer than honeycombs. You will also normally find that brood combs are a bit thinner than honeycombs.