Same brand, different battery
Greenworks also sells Greenworks 24V, Greenworks 40V and Greenworks 80V. We have no source saying their packs fit Greenworks 60V tools, so don't assume a shared brand means a shared battery.
The Greenworks 60V lineup
Greenworks 60V is Greenworks's cordless battery platform. PowerToolGrid lists 38 products in it: 6 batteries, 9 lawn mowers, 4 string trimmers, 8 leaf blowers and more. Prices on file run from $129.99 to $899.99.