It can be differentiated from Alençon by looking at the mesh. 
Since Burano lace has been worked more tightly the mesh appears more square. 
Also you see upon very close inspection that the outline stitch is whip stitched in Burano (buttonholed in Alençon) 

Excerpt about Burano and it's lace by Janice Blair

      Burano is the home of Museo Del Merletto, a lace museum
 and lace school in operation since 1872.  Whilst looking around the
 exhibits I met a Dutch lady who recognized my bobbin lace necklace
 purchased at the IOLI convention.  We had a long talk about bobbin lace
 and she told me she had known a very old lady in Holland who had made
 lace as a child to help with the family income.  She had to work twelve
 hours a day at the age of ten whilst her brothers were allowed to play.
 She negotiated with her mother for one afternoon a week off so that she
 could play by foregoing that evening meal!

     As we chatted quietly we could hear in the distance the lacemakers
 talking very loudly, it sounded like a very full room.  When I reached
 the end of the building  where they were working I was surprised to see
| only seven ladies making needlelace, but as they worked they chatted.
 My Italian is non-existent apart from simple phrases.  I managed to find
 one lady, Suzie, who spoke a little English and she told me that they
 each worked parts of the same piece of lace, each one being more
 experienced in the different stitches, and that it could take three
 months to make a piece of needlelace.  She pointed out that Venetian
 stitch resembled the arched bridges over the canals in Venice and the
 Burano stitch looked to me like a small square talley.