Equally hard problem? 

Can any of you mathematical wizards out there tell me if this problem is equivalent or equally hard? My 4th grade daughter had this question for some bizarre reason in her science class:

Given three sets:

A = {4, 5, 7, 9, 1}
B = {5, 5, 3, 3, 1}
C = {2, 10, 6, 8, 3}

Can you exchange one number from each set with a number from a different set so that the sum of the numbers in each set is equal?