I'm in the final few months of my MD degree at an Australian medical school.
I also spent time in the USA and England completing clinical electives for my medical degree.
I'd say there's no real difference at all.
The only aspect I found especially different was the differences in insurance between the nations.
I still don't fully understand the US healthcare system's approach to insurance (and likely never will).
However, in terms of content, style of teaching, ward time, etc. they're all the same these days.
Happy to answer more specific questions, though.