Synonyms of 'interchangeable'
identicalDictionary, the same, equivalentHis greatest innovation was the use of interchangeable parts.
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Equivalent is also an adjective.
A unit of alcohol is equivalent to a glass of wine.
A reciprocal action or agreement involves two people or groups who do the same thing to each other or agree to help each another in a similar way.
They expected a reciprocal gesture before more hostages could be freed.
Thesaurus for interchangeable from the Collins English Thesaurus
Things that are interchangeable can be exchanged with each other without it making any difference .