Yes. Subtraction is the same process as adding the opposite.
For example, take the expression 9 - 4. The opposite of 4 is (-4). 9 + (-4) is exactly the same as 9 - 4. This relationship is a fundamental concept of early math development, and is often poorly taught in the primary grades.
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Addition and subtraction can be thought of as the same thing because subtracting a negative number is the same as adding it and adding a negative number is the same as subtracting it.
They are different in the same way that subtraction of integers is different from their addition.
Addition and subtraction are inverse functions.
perimeter is adding the lengths of the sides together
Adding +k is the same as subtracting (-k).