How to Compare formulas???

Is there a formula or VB code that will compare formulas in two different cells and not compare the return value.

For example

A1 contains =SUM(E1:E3) and returns 10
B1 contains =SUM(E1:E3) and returns 20
C1 contains =SUM(F1:F3) and returns 10

D1 will include a formula that will compare the formulas within A1 and B1 and return a TRUE value as the two formulas are identical even though the returned values are different (10 and 20).
D2 will compare the formulas with A1 and C1 and return a FALSE value as the formulas are different even though the returned values are identical.

Hope that is enough explanation and thanks for any solutions or tips.

thanks
Arfan