As long as you dont want parts from the water section below the combustion box then you should be somewhere near, but the water sections are totally different.
230 has a pancake round expansion vessel held in with a huge jubilee and the 240 has a cylinder type expansion vessel.
All pipes are different to boot.
If you are using an electrical part I would check serial or part numbers first
Thanks for the reply. I am actually after such items as the DHW heat exchange and the diverter valve? I guess from what you say these are completely different then?
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