Basically, there is no difference at all. You will walk on the same route through the same villages up to the base camp and back. The only difference is that you will have an additional 2 days acclimatization time on the trek. This is probably the longest version of the Everest Base Camp trek and we have created this trip for those travelers who want to relax and walk at a slower pace. The 16-day EBC trek is best suitable for first time hikers who actually get extra time to combat the possibilities of being struck by Acute Mountain Sickness (AMS).