Hello 
The flash memory seems to be the main difference between the two models however to see a specification for both you will need to look on both the UK Sony website and also the one for the Middle East and Africa. Here are the two product pages:
http://www.sony-mea.com/product/hdr-cx760e - There is a tab to click on for the specification
http://www.sony.co.uk/product/cam-high-definition-on-memory-stick/hdr-cx730e#/TechnicalSpecs
This may be because the CX760e has been aimed primarily at the Middle East and African market and in the same manner, you need to look on the UK site for the CX730e.
Thanks,
Simon