Can you use PCII maps on a PCIII?

First go at buggerising around with maps on a Powercommander today on a VFR800. They have maps for a PCII with the mods done to the bike but only similar mods with maps for the PCIII. Can they be used? What is the difference between PCII and III? Thanks.
Might have to get one of these injected bikes. Easier than frigging with jetting!
