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b. 18

composition: Op. 27 No 2, Nocturne in D♭ major

A slur in A

No slur in GE (→FEEE)

..

That slur in A is placed at a certain distance from the notes and obscured with the indication con forza. That is why the engraver of GE could overlook it or even consider it deleted. 

category imprint: Differences between sources

issues: Errors in GE

b. 18

composition: Op. 27 No 2, Nocturne in D♭ major

An accent in A (→GE)

The accent is moved to the right in FE (→EE)

..

Placing the accent under the 2nd octave of the motif in FE (→EE) is almost certainly a mistake. We preserve the unambiguous notation of A.

category imprint: Differences between sources

issues: Inaccuracies in GE

b. 19-20

composition: Op. 27 No 2, Nocturne in D♭ major

A slur added by Chopin when proofing FE (→EE)

An earlier version of A (→GE)

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE

b. 19

composition: Op. 27 No 2, Nocturne in D♭ major

A flat in the version of FE (→EE) corrected by Chopin.

e flat in A (→GE)

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes , Authentic corrections of FE

b. 19

composition: Op. 27 No 2, Nocturne in D♭ major

Fingering in A (→GEFE)

No fingering given in EE

..

In EE the fingering number for d flat half through the bar is missing. This is most probably an oversight. 

category imprint: Differences between sources

issues: Errors in EE