[Python] Pandas "Can only compare identically-labeled DataFrame objects" error

I'm using Pandas to compare the outputs of two files loaded into two data frames (uat, prod): ...

uat = uat[['Customer Number','Product']]
prod = prod[['Customer Number','Product']]
print uat['Customer Number'] == prod['Customer Number']
print uat['Product'] == prod['Product']
print uat == prod

The first two match exactly:
74357 True
74356 True
Name: Customer Number, dtype: bool
74357 True
74356 True
Name: Product, dtype: bool


For the third print, I get an error: Can only compare identically-labeled DataFrame objects. If the first two compared fine, what's wrong with the 3rd?

Thanks

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