Can Post Processing ' Upgrade' camera??!

On the subject of upgrading cameras,say to a later, or different
version,which is said to provide better photo quality. It occurs to me
that post processing images from the ealier model might have the effect
of 'levelling up' the difference, so that this can catch up with the
'improvement'.

I would be interested to hear the thoughts of other members.

Denis Boisclair
Cheshire, UK.