Hi Daniel,
No need too.
XP10 and xp11 are totally different standalone packages. They do not impact on each other provided you do not try and load XP11 into the XP10 directory. In other words they require there own directories.
Load the packages onto the desktop or a dedicated additional drive. Don't mix them into your operating systems files as the X-Plane packages will give you problems.
On the other hand, some of your third party XP10 software packages (if you have any) may not run within XP11.
Hope this helps
Glenn