the one that moves with accelerator cable is the main butterfly, the other one opens using vacuum, the second butterfly works only when the car is at high speed. so its okay, thats normal
second thing you encircled seems to be the fuel cut solenoid(talking abt the one with the black wire) it cuts the petrol flow you switch off the car
i don't see any reason to replace those steel fuel lines
no idea about the second pic (where you highlighted with the rectangle)