Here is the static thrust ratings for the 757-200

Rolls-Royce RB211-535E4
40,200 lb (179 kN)

Rolls-Royce RB211-535E4B
43,500 lb (193.5 kN)

Pratt & Whitney PW2037
36,600 lb (162.8 kN)

Pratt & Whitney PW2040
40,100 lb (178.4 kN)

and here is the static thrust for the 757-300

Rolls-Royce RB211-535E4B
43,500 lb (193.5 kN)

Pratt & Whitney PW2037
36,600 lb (162.8 kN)

Pratt & Whitney PW2040
40,100 (178.4kN)

Pratt & Whitney PW2043
42,600 lb (189.4 kN)

I can see where they got the 40117 from, it seems to more balance out the two engine model types with one aircraft.cfg.

I guess as i only fly the RR based 757-200 it would pay for me to edit mine to 40,200 or 43,500. But i am happy with the performance i get on climb from the engines.