Of course they're not the same thing, but they're both still new models. Are they not? Or do you not consider any of the MacBook's released between February 2013 and May 2015 new models either? They were just spec bumps after all.
There is no 2016 function key 15" model. The current alternative 15" function key model dates from 2015. So a redesign from 2015 era that skips the touch bar for October 2017 would updating a relatively old model. If Apple didn't mash it thinner, provisioned space for so-DIMMs, added a Type-A socket , and skipped the much higher expensive of the touch bar, they would have a solution for what many were complaining about.
Suffice to say, it is extremely unlikely Apple will refresh/update/spec bump/new model the MacBook Pro line up in both June and October this year. An update to 13" line-up in June and 15" in October (or vice-versa) is plausible but both, twice, not going to happen.
If split function key and touch bar there are 4 models to play with; two in each 13" and 15" sccreen size. So can do 15" touch bar now , 15" function key October , 13" touch bar now , 13" function key October (with maybe price cut now if drop the 2015 MBP 13" ... or price cut both if keeping 2015 model as long term legacy model like 2012 model recently was. ) .
bumping the touch bar models will push more customers into the higher touch bar price point (Gen 7 is a value add .. maybe even a battery catch up for the 13" model versus the 2016 function key's bigger battery.). The lower price point folks probably won't care in the 13" space missing Gen 7 (at least for 6 months or so) and settle for the 2015 in the 15"
I don't think Apple is going to get rid of the function key versus touch bar price gap anytime soon. Now that Retina screens has almost completely gone mainstream they will probably leverage touch bar to push the average selling price higher. That still leaves them with two parallel MBP lines which need updates.