=LEFT(INDEX(A:A,SMALL(IF((LEFT($A$3:$A$91,19)=LEFT($A$2:$A$90,19))*(RIGHT($A$3:$A$91,4)-RIGHT($A$2:$A$90,4))>COLUMN(A:AZ),ROW($2:$90),99),ROW(1:1))),19)&RIGHT(SMALL(IF((LEFT($A$3:$A$91,19)=LEFT($A$2:$A$90,19))*(RIGHT($A$3:$A$91,4)-RIGHT($A$2:$A$90,4))>COLUMN(A:AZ),ROW($2:$90)*10^4+RIGHT($A$2:$A$90,4)+COLUMN(A:AZ),999999),ROW(1:1)),4)
Ctrl+Shit+Enter