I'm looking to buy the MT-40. The website states that it has a 10 speed compatible chain tool. Can this same tool work with my 11 speed chain (Shimano 105 (11 speed) group set so I think the chain is 11 speed). Is there any difference between 10 and 11 speed chain tools?
There are chain tools out there (for Shimano/SRAM) which are recommended for 10 speed but not 11 speed (and Campagnolo needs a 11 speed chain tool for peening); Pedros makes at least one which they specifically mark this way (the ICM Multi Tool). The problem with using a chain tool not designed for 11 speed might be due to the dimensions of the rivets and how tight they are in there, the chain tool may warp the plates on the chain when putting in the new pin.
I'd suggest emailing Park Tool to ask, but I'd think they put 10 speed there for a reason.