In Microsoft Excel 2002, is it possible to compare data from TWO
PivotTables? These tables have different sources and the fields I need
to compare are both a sum. Also, I'm not just comparing two individual
cells or I would use the GetPivotData Function. I need to compare a
column of row sums to multiple rows of column sums. If this is
unclear, I would be happy to email an example.

I am on an excel roll.  Without seeing the tables it is hard, you
could try to using some vlookups.  I am assuming both tables have the
same key viewed to compare.  Next to one of the table put a vlookup
looking for the key field, select range of the other table and count
to the sum field, remember to include "false" at the end for an exalt
match.  That is how I would do it.