Hi,
there's little value in a straightforward comparison, because 4.1 is an evolution of 4.0 (i.e. new enhancements) plus a consolidation of fixes.
so 4.1 will contain everything you see in the "what's new for 4.0" , plus "what's new for 4.1" , plus "fixed issues in 4.1"
As Seb indicates, an in-place Update of the 4.0 system will take you to the General Availability version of 4.1 when it is released. I believe the expectation is that this will be called 4.1 SP01
Regards,
H