The MATCH function searches a range of cells for a specified item and returns its relative position within the range. If the values 5, 25, and 38 are in the range A1:A3, the formula =MATCH(25,A1:A3,0) produces the number 2, because 25 is the second item in the range.
Selecting both lists and then clicking Conditional Formatting -> Highlight cells rules -> Duplicate Values is the quickest approach to find everything about them (Excel 2007). As a result, the values that are the same in both lists are highlighted.
The MATCH function in Google Sheets displays the relative location of an item inside a range of cells. In other words, if you want to know where a specific number is in a range or array, MATCH will tell you where it is.
If you believe the data is in the spreadsheet but MATCH can't find it, it's possible that it's because: The cell contains unusual characters or hidden spaces. It's possible that the cell isn't formatted correctly. The cell, for example, may contain numerical numbers yet be styled as Text.