In A the 
indication is written slightly later, so it could be considered to be valid only from the beginning of bar 1 or even to be referring to the bottom voice in the R.H. According to us, it is a manner of placing the indications within their range of validity and not at the beginning, sometimes used by Chopin. This is how it was understood in the editions.
List of performance indications present in AI in bars 1-19:
bar 1 (beginning of the piece) – Vivace,
bar 1-2 – long accents over the R.H.,
bar 5 – an accent in the R.H.,
bar 7 – accents in the L.H.,
bar 10-11 – slurs and accents in the R.H.,
bar 13 – an accent in the R.H.,
bar 16 – 
.
We do not signalise the absence of the remaining indications in the case it is the only difference between the sources; we also do not consider it as an equal version in the remaining cases. From the practical point of view it means that when AI is not mentioned in the text of the note, the discussed indication is absent in the autograph.
category imprint: Differences between sources
notation: Verbal indications
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