https://salsacycles.com/bikes/marrak...deore_drop_bar
https://salsacycles.com/bikes/marrak..._flatbar_deore

Why does the flat bar marrakesh have different geometry than the drop bar Marrakesh?

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Bike fit is the most important part of a touring bike. If you are comfortable on your bike you might just enjoy your tour.
Second guessing the people that make bikes cost you safety and comfort, and money when you have to put yor bike back the way it was supposed to be. Most anything works rolling around Green Lake. When you get to Rancho Grande you can tell the difference.

Butterfly touring bars are made to replace flat bars, and made with flat bar frame geometry in mind, in mind by professionals.

Shade tree just dont work for the long run.

By the way, it is not just the stem length, but, the width and sweep of the bars that make or break a bike fit.