The MCP655 was designed for PC water cooling which means head pressure was a major consideration.
Your pump has been designed to empty a washing machine and given its operational criteria it doesn't require that much head pressure but does require substantial flow.
For example, it is unlikely that the washing machine would need to move water up 1 1/2 stories in a house. Typically, it wouldn't even need to move it 4 ft.
I think the type we use are called
centrifugal pumps.
Subtle differences in the design of the impeller and the impeller chamber, along with the power of the motor, have effects on the static head pressure and the flow rate.