Yes, some expressions can be identical in value.
The Celsius and Fahrenheit value are identical at -40 degrees.
equals
Two or more things are identical in value when they have the same numerical or quantitative worth. This means they can be exchanged for each other with no loss or gain in value.
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The value of a minim rest is identical to that of a minim note.
They are identical in value.
identical value
It means they come out to the same number.
The Value of the Determinant becomes 0
Yes.
They are callled: Identical equations or Identities See: http://www.tutorvista.com/search/value-algebraic-expressions
They are identical or equivalent.