Could a Merlin-powered P-40 serve as a useful stopgap fighter?
Short answerYes, if the selected Merlin variant gives it a performance advantage.
NotesA Merlin-powered P-40 is proposed as a stopgap before later fighters become available in large numbers. Its usefulness depends on which Merlin variant is fitted and whether the engine improves performance. The opposing fighter names in the question remain unclear, leaving a more specific aircraft comparison unresolved.