An equality.
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Equivalent expressions.
If both equations can be simplified to the same value, they are equal.
The same overall value.
You can have infinitely many mathematical expressions that equal 13. Or any other given number. For example, 13 + 0, 12 + 1, 11 + 2, etc., then 0 + 13, - 1 + 14, -2 + 15, etc. ... there you have infinitely many. You can make up lots of other types of expressions that give the same result.
2+2 = 2*2 = 2^2 all simplify to 4. But there is no special name for the three expressions.