MK will get switched over after the last
MNSSHP which is usually on Nov. 1st. Then it will be decorated for Christmas and Jungle Cruise begins, with first official castle lighting happening on first
MVMCP(has been Nov. 7th - 9th), but usually will test it out a few days prior. So technically yes, you can see both as far as MK goes. Other parks and resorts will be started, but if you really want to see everything, you need to wait till later in Nov. - all done by Thanksgiving, but some done by midmonth, like giant gingerbread house at GF, usually done around 14th-16th.
Just an FYI, it is generally a busy week with Wine & Dine Marathon, Jersey Week, Veteran's Day, end of Wine & Dine Festival. You probably would have lighter crowds and see more Christmas decor midmonth or after Thanksgivings, but if you want to see both, just make sure you are well planned to help get a lot done with bigger crowds. We were there this year that week(taking advantage of Jersey Week w/days off since DD in HS now!) and while it was crowded, we did most everything we wanted with a good plan. Also, you might want to make a hotel reservation soon if thinking of staying onsite, as I had a difficult time getting the days we wanted when starting looking in August - had to reserve part of week in Sept., then add the others separately as things opened.