As Jerry/MT has posted correctly, HP has a definition and can be applied across the board to all engines. Yes, indeed a 250 HP Yamaha or 250 HP Chevy can pull the same load at the same speed up the same hills as a 250 HP Cummins. There are differences, the Cummins will certainly give a longer service life and as such would be a better choice for the service you imply.
Since the Yamaha and Chevy would develop 250 HP at a higher RPM, a proper transmission/gearing would be required to demonstrate the ability to pull on par will the Cummins.
There are high speed engines used in heavy load aplications. For example, consider the Honeywell AGT 1500 (google for details) used to power the Abrams M1 Tank. Typically, the specs for this engine are given as 1500 HP, 2750 Ft-Lbs torque at 3000 RPM. However, this is taken after a 10:1 reduction gearbox packaged into the engine. The numbers ahead of the gearbox would be; 1500 HP, 275 Ft-Lbs at 30,000 RPM. HP is HP however, gearing must used to match the engine/power to the application.
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