VBA to compare and highlight differences

Hi Everyone! I haven't been able to find what I'm looking for so maybe someone might be able to help. I have to worksheets I get from two different dbases do the output is slightly different in each. What I need is simple, (I think). Just need to get a VBA that looks from Sheet1 to Sheet2 for a doc number. If it's not on Sheet 2, simply highlight it BLUE on Sheet, AND then looks from Sheet2 to Sheet1, and if it's not on Sheet1, then highlight the entry on Sheet2 GREEN.

I.E.

SHEET1 SHEET2
COL A COL A

11111 AAAAA
22222 BBBBB
33333 11111
AAAAA 44444


Thank All!!!