Are samphire and asparagus interchangeable in recipes?

Whilst samphire is sometimes referred to as 'poor man's asparagus', the difference in taste is quite significant.

Whilst both are delicious in their own right and may both work in certain recipes; generally speaking, they should be thought of as entirely separate foodstuffs.

Asparagus has a more subtle taste than asparagus and can be used in mild risottos, for example. Whilst samphire may also be used in risottos, these should be ones with a stronger flavour, perhaps ones using shellfish, for example.

Whilst both vegetables may have certain things in common, they are not really totally interchangeable, although experimentation may mean finding receipes where one substitutes for the other works very well!