interestingly, no other aircraft copied the P51’s design
As noted by others the MB 5 seems to qualify, as does the Australian designed CAC 15 pictured here, was originally designed to be powered by a P&W R-2800 with turbocharger but unavailabilty required swapping to a Griffon.
The proposed Rolls Royce FTB using components from the P-51 would also qualify.
but I'd be interested to know if the resemblance is superficial, or a sincere piece of flattery
Various sources do say the radiator made use of the Meredith effect without giving knowledgeable attribution, but it's reasonable to assume it does, particularly given the inlet is positioned out of the boundary layer. Nor is it a sincere piece of flattery, F. W. Meredith, who developed the idea, was a British engineer working at the Royal Aircraft Establishment (RAE), Farnborough and the P-51 was an aircraft designed in the USA, developed and paid for by the British ($US12 million of their scarce foreign exchange) with design input from British engineers at RAE. The USA forces had initially absolutely no interest in the aircraft, the two test aircraft given them languished on the flight line without much interest, in the meeting of USA forces to discuss the way forward with future fighters the P-51 was not even on the list of possible contenders.
Thanks to all for the P-51 headsup, yellow my favourite colour.