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equivalent
This word carries a clinical, precise tone often found in mathematics, chemistry, or legal documents. It suggests a balance where two different things occupy the same "weight" or "status" despite having different forms or identities. It is less about being identical and more about being interchangeable in a specific context. In social or professional settings, using this term avoids the simplicity of "same." It implies a calculated comparison, making it ideal for technical specifications or formal arguments where a direct one-to-one mapping is required.
Countable when referring to a specific item that matches another (an equivalent). Uncountable when discussing the general state of equality (the equivalent of).