Bit of banter.
Diameter of nozzles for 80 ton engine used seems to be 72 centimeters.
Diameter of nozzle for Hwasong-7 is 62 centimeters.
72 centimeter nozzle is enough to support 40 ton force of thrust.
62 centimeter nozzle is enough for up to 30 ton force of thrust.
Hwasong-14 has no comparable missile to it to exact details.
Besides diameter and thrust being close to close to R-21/SS-N-5 Serb:
Difference being Hwasong-14 has second stage.
Hwasong-15 comparable to UR-100/SS-11 Sego.
Hwasong-17 comparable to UR-100N/SS-19 Stiletto.
Yet fuel load and thrust is closer to R-26/SS-8 Sasin.