Correct me if im wrong (please) but my question is with ICSP, are the ICSP programming all the same for all the pic18's regardless of VDD/VSS voltages...

So, for example...
The PIC18F4550 is a ~5V chip and is directly supported by my JDM but can be used by ICSP also...
The PIC18F97J60 is a ~3V chip... can it still be programmed by the ICSP from the JDM programmer?