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well they look similar but really have nothing to do with each other
andre bornand did make a pocket watch that was similar to the 3699 caliber but they have a "bornand" cage in copper beryllium rather than the cage made in steel in the jlc 170. However, i do think JLC made the school watch ebauches which were very similar to the 170 made with the 170 cage or a grether type 3 cage and sometimes had twin barrels. These ebauches were used by Urban jurgensen, Jean pierre hagmann and Antoine Preziuso who weirdly used it in a few wristwatches as well.
No.
Bornand made it himself not using any base. He also constructed the caliber 34T for patek