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Originally Posted by Craig
Just to clarify for the original poster, the W123 and W126 units are different parts. I don't know why/if a W123 unit may work in a W126, but I would not assume they are fully interchangeable or that a W126 unit will work in a W123.
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A comparison of the electrical schematics shows that the W126 unit has an additional relay and connection (C-2/11) for the fresh/recirculated air flap. The W126 has a three-position flap which is controlled by three vacuum actuators via two switches. The W123 unit will not contain this circuit.