The version of GE, in which the figures in the L.H. in the 2nd halves of bars 250 and 251 are swapped, was initially also in FE, where, however, Chopin changed it in the last stage of proofreading. It was most probably a mistake of the engraver of FE. The correct order of figurations in FE is additionally confirmed by the fingering written in FED in bar 251.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Authentic corrections of FE, Errors repeated in GE
notation: Rhythm