What is the difference between 42CrMo4 and 25CrMo4 steel pipes

What is the difference between 42CrMo4 and 25CrMo4 steel pipes?
25CrMo4 steel pipes are alloy structural steel pipes. When the temperature is 500-520℃, it has good high-temperature strength, good workability, medium cold bending plasticity, high hardenability, and good welding performance. 25CrMo4 steel pipes are generally used in the quenched and tempered state. They are used to manufacture non-corrosive media in chemical equipment, high-pressure pipes with nitrogen and hydrogen media and operating temperature below 250℃, and various fasteners, steam turbines, boiler blades, advanced carburizing parts, Gears, sleeves, etc.

Equivalent Materials to DIN 25CrMo4
A519 AISI 4130 pipes, SAE 4130 tubes, JIS SM420 SCM430 pipes, EN 25CrMo4 tubes, DIN 1.7218 pipe, AFNOR 25CD4 tube fittings, BS 1717CDS110 pipe bending, BS 708A25 tubes, UNI 25CrMo4(KB) elbows, SS 2225 flanges, UNE 55Cr3 elbows, EN 1.7218 fittings, UNS G41300 elbows, UNS H41300 flanges, IN 17205 Grade GS-25CrMo4

42CrMo4 vs 25CrMo4 steel pipes with air quenched and tempered

General Infor:

Mechanical property of 25CrMo4 steel pipes
Density: 7.85 g/cm³
Elastic modulus: 211.0 GPa
Elongation: 16.0%
Poisson's ratio: 0.29 [-]
Tensile strength: 550.0-700.0 MPa
Yield strength Rp0.2 300.0 MPa

Thermal of 25CrMo4 steel pipes
Coefficient of thermal expansion: 1.1e-05 1/K
Max service temperature, long: 0.0-300.0°C
Melting point: 1382.0-1529.0 °C
Specific heat capacity: 448.0-502.0 J/(kg·K)
Thermal conductivity: 36.0 - 43.0 W/(m·K)

Chemical Composition of 25CrMo4 steel pipes
Carbon: 0.22-0.29%
Chromium: 0.8 - 1.2%
Manganese: 0.5 - 0.8%
Molybdenum: 0.2 - 0.3%
Phosphorus: 0.02%
Silicon: 0.6%
Sulfur: 0.015%