2 in 
Stylistically speaking, the version of GE is absolutely possible – such melodic sequences can be quite frequently found in Chopin's pieces (cf. bar 610 or bar 66 in the 2nd mov. as well as, e.g. the Ballade in G Minor, Op. 23, bar 45 and 47). However, in this case, nothing supports the authenticity of that version – in similar contexts, in spite of the step of augmented second, Chopin used a harmonic note in bar 636 as well as in bar 624, 628 and 640.
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category imprint: Differences between sources
issues: GE revisions
notation: Pitch
