Which version of unreal engine 4 has been used to create fortnite and pubg-mobile

which version of unreal engine 4 has been used to create fortnite and also which version of unreal engine 4 has been used to create pubg-mobile

ask in forums perhaps not here.
I think last time i looked pubg was at 4.18. Fornite will be a fork of the most recent branch at a guess…