are your worksheets really named Cat 1 to Cat 4? if so, u can use this 1 formula at B2 & paste it to the rest:
=IF(ISNA(VLOOKUP($A2,INDIRECT("'Cat "&COLUMN(A2)&"'!$A$1:$B$3"),2,FALSE)),"",VLOOKUP($A2,INDIRECT("'Cat "&COLUMN(A2)&"'!$A$1:$B$3"),2,FALSE))
if not, u can use this at B2 & paste to the rest but u need to find & replace Cat 1 to Cat 2/3/4 for each different columns:
=IF(ISNA(VLOOKUP($A2,'Cat 1'!$A$1:$B$3,2,FALSE)),"",VLOOKUP($A2,'Cat 1'!$A$1:$B$3,2,FALSE))
ISERROR as mentioned from vlady works as well. it's just a personal preference of mine to only make sure other errors other than #N/A gets highlighted for VLOOKUP
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