Create report compareing 2 Sheets

If you run a macro, stored in your Personal.xlsb, on the sheets, it does not care about what version the sheets are so long as their names are the same, e.g., sheet1 and sheet2.

The sheets to be compared have different names daily. I always compare today with yesterday, for examle (sheetnames: 120509 and 110509)
I am able to locate the sheets with the names of todays and yesterday dates.
But how do i do the marcro to find who is in sheet1 and not in sheet2 and who is in sheet2 but not in sheet1?
I can only find macros that search for dublicates, but that does not help me.