Here is a reference link for all processor types from Intel.
And Processor Socket Types:
For the Pentium III class from Intel.
For the Pentium II class from Intel.
The core voltage ranged from 1.35 volts to 1.75 volts.. and some early models used a 2.0 volt core.
The Pentium II and Pentium III class were somewhat interchangeable, if in the cartridge package.
There are socket adapters known as "Lin-Lin" that allow setting the voltage/bus ranges with jumpers.. for some non-supported processors on some mobos.