MC cartridge output measurements

Can someone tell me what is the conversion ratio from the JVC 3.54cm/sec standard to the CBS 5.0cm/sec standard. In other words, if a cartridge output is measured at .3mv using the JVC standard, what would be this cartridge output using the more common CBS measurement standard. Benz and Zyx are using the JVC standard to measure their cartridge output while most other (if not all) cartridge manufacturers use the CBS standard. Thank You. Sly