Thank you all for your help. I'll try these as soon as I can

"Daniel.C" wrote:

Somewhere on row 1 :
names matches (array formula, validate with CTRL+Shift+Enter) :
=IF(LARGE(IF(ISNA(MATCH(Sheet2!$A$1:$A$15,Sheet1!$ A$1:$A$15,0)),0,MATCH(Sheet2!$A$1:$A$15,Sheet1!$A$ 1:$A$15,0))*IF(ISNA(MATCH(Sheet2!$B$1:$B$15,Sheet1 !$B$1:$B$15,0)),0,1),ROW())0,INDEX(Sheet1!$A$1:$A $10,LARGE(IF(ISNA(MATCH(Sheet2!$A$1:$A$15,Sheet1!$ A$1:$A$15,0)),0,MATCH(Sheet2!$A$1:$A$15,Sheet1!$A$ 1:$A$15,0))*IF(ISNA(MATCH(Sheet2!$B$1:$B$15,Sheet1 !$B$1:$B$15,0)),0,1),ROW())),"")
first names matches on row1 too and array formula too :
=IF(LARGE(IF(ISNA(MATCH(Sheet2!$A$1:$A$15,Sheet1!$ A$1:$A$15,0)),0,MATCH(Sheet2!$A$1:$A$15,Sheet1!$A$ 1:$A$15,0))*IF(ISNA(MATCH(Sheet2!$B$1:$B$15,Sheet1 !$B$1:$B$15,0)),0,1),ROW())0,INDEX(Sheet1!$B$1:$B $10,LARGE(IF(ISNA(MATCH(Sheet2!$A$1:$A$15,Sheet1!$ A$1:$A$15,0)),0,MATCH(Sheet2!$A$1:$A$15,Sheet1!$A$ 1:$A$15,0))*IF(ISNA(MATCH(Sheet2!$B$1:$B$15,Sheet1 !$B$1:$B$15,0)),0,1),ROW())),"")
Drag down as needed
PS : I used A1:B15 ranges on both sheets. Adjust to your needs. You should
choose the greatest range.
PPS : There should be a simpler formula but I cannot figuree it out.
PPPS : Please, ignore if this is the second post. I have not seen the first
one.
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Regards.
Daniel