Fitting a later 110 engine (123 series) into a 115 series

Anyone tell me? Is there any big pitfalls in fitting a K jetronic M110 engine from an 83 W123 car into a 72 w115 series car, whilst preserving its original
D Jetronic system. Is it possible, or are there just too many differences t make this late K jetronic engine D Jetronic compatible. Reason is that The 123 series engine was completely refurbed (bills to prove) shortly before the 123 car was crashed. Its a pearler of a motor, but will it just drop in?
Thanks... Rob.
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