Mendelssohn: Concerto in A minor for piano and strings

For the last three days, I've listened to Mendelssohn's Concerto in A minor for my CMQ project (I was reading a Mendelssohn biography last February, which is why that piece was in the queue so much).  The first time I listened to it for the CMQ (which was only the second time I'd ever listened to it), I noticed a phrase in the strings near the beginning of the first movement (it's also near the end of the movement).  It took a few minutes to place, but I eventually remembered that Mozart's "Eine kleine Nachtmusik" (Serenade No. 13 in G major K. 525) starts with a similar phrase.

I looked up the scores for both so I could compare them.  I had a bit of trouble with the Mendelssohn concerto in that the only notation I could find is apparently the original manuscript.  Mendelssohn wrote it when he was pretty young, and I don't think it was actually printed.  Because it was hand-written, there's a greater likelihood that I miscounted my measures.

In any case, when I looked up the notation and found the part I'd heard, I was surprised by how similar it is to Mozart's phrase.  While they're an octave lower, the first six pitches are the same, and the first five note values are the same.

(click the image to enlarge it)
(notation found here [Mozart's Serenade] and here [Mendelssohn's Concerto])

The middle line is my standardized rendering of the two violin parts in Mendelssohn's Concerto; at the beginning of that line, there are two treble clefs, and I'm assuming that it means that the two violin parts there are the same.  I was going to do the same for the viola and bass parts, but I had some difficulties with my program.  I found the original manuscript a bit difficult to read, but I think those other string parts match Mozart's too.

I went back and referenced the Mendelssohn biography I'd read (R. Larry Todd's Mendelssohn: A Life in Music) to see if I could find anything about this Mozart quotation.  Todd mentions Mendelssohn's being "thoroughly captivated" by Johann Hummel's A minor piano concerto and that Hummel was a student of Mozart, and he also says that Mendelssohn's concerto "marks an impressive achievement of an apprentice, who anticipated elements of his own mature style while he assimilated the legacy of Mozart's concerti and tested Hummel's innovations in piano technique."  There isn't anything there about that quotation of Mozart's serenade, but clearly Mozart was an influence.