The Model 100 is a stretched derivative of the Model 90 featuring five cabin windows instead of the Model 90’s three; MTOW increased by 1,300 lb (590 kg) over the 90, to 10,600 lb (4,810 kg). The 100 used the wings, tail, and engines (two PT6A-28 engines, although rated at 680 shp)[10] from the Model 99 airliner, itself a development of the Queen Air (as was the Model 90).

Sourced: https://en.wikipedia.org/wiki/Beechcraft_King_Air#Model_100_series