What is the difference between the properties of 15CrMo and 20CrMo steel

What is the difference between the properties of 15CrMo and 20CrMo steel?

The difference of chemical composition between 15CrMo and 20CrMo steel:
Chemical composition of 15CrMo steel:
C: 0.12-0.18, Si: 0.17-0.37, Mn: 0.40-0.70, Cr: 0.80-1.10, Mo: 0.40-0.55.

The chemical constituents of 20CrMo steel are as follows:
C: 0.17-0.24, Si: 0.17-0.37, Mn: 0.40-0.70, Cr: 0.80-1.10, Mo: 0.15-0.25.

Difference of mechanical properties between 15CrMo and 20CrMo steel:
15CrMo steel mechanical properties: tensile strength: 440 MPa, yield strength: 295 MPa, elongation after fracture: 22%, shrinkage after fracture: 60%, impact absorption energy: 94J.

20CrMo steel mechanical properties: tensile strength: 885 MPa, yield strength: 685 MPa, elongation after fracture: 12%, shrinkage after fracture: 50%, impact absorption energy: 78J.