Hello Hairul,
I don't think there is a difference. The CAB-JPN is a 3 pin cable, exactly the same as the CAB-JPN-3PIN.
Here is a picture of the CAB-JPN:
https://www.cablesandkits.com/ac-power-cord-japan-cabjpn-p-269.html
Check Figure C-16 (this is what Cisco refers to as CAB-JPN-3PIN):
http://www.cisco.com/c/en/us/td/docs/video/cds/cde/cde205_220_420/installation/guide/cde205_220_420_hig/portcabl.pdf