Platforms it's compared with
We have no source saying any of these share batteries with Craftsman V20, so owning both means two sets of packs and chargers. Each comparison lines the two platforms up tool by tool.
Same brand, different battery
Craftsman also sells Craftsman V60. We have no source saying its packs fit Craftsman V20 tools, so don't assume a shared brand means a shared battery.
The Craftsman V20 lineup
Craftsman V20 is Craftsman's cordless battery platform. PowerToolGrid lists 27 products in it: 4 batteries, 2 lawn mowers, 4 string trimmers, 5 leaf blowers and more.