""H-40"" stern difference

[thebunkerparodie]

Hello,

Why is H-40 stern draw difefrently than the one of the H-39?

https://wiki.wargaming.net/ru/Navy:%D0%9F%D1%80%D0%BE%D0%B5%D0%BA%D1%82_%D0%BB%D0%B8%D0%BD%D0%B5%D0%B9%D0%BD%D0%BE%D0%B3%D0%BE_%D0%BA%D0%BE%D1%80%D0%B0%D0%B1%D0%BB%D1%8F_H-40

[Thoddy]

Four screws

[thebunkerparodie]

ok ,so the rear must be redesign because of one more propeller