Compare Multiple Data Changes with Similar Project Titles

[pmack]

I've got a list of Projects with multiple unique month values. What I want to do is take Jan data and compare to the Feb data (same file layout, just different dates) to see if people are changing Feb data after it was entered in Jan. Did they change targets after they were already locked in? In example below, I'd expect the fields below in Red to be flagged as changed. Would expect a Vlookup on the Feb Tab looking at the Jan Tab, but having issues with having multiple lines with Same Project ID. All help appreciated.

January Data Tab					February Data Tab
Project		Sales Target	Sales Confirmed		Project		Sales Target	Sales Confirmed
1	Jan	50	50		1	Jan	50	40
1	Feb	50			1	Feb	40	40
1	Mar	50			1	Mar	40
2	Jan	100	90		2	Jan	90	90
2	Feb	100			2	Feb	100	90
2	Mar	100			2	Mar	100
3	Mar	75			3	Mar	75
3	Apr	75			3	Apr	75
3	June	75			3	June	75

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