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.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.