Question

can the value of z be same for two different numbers?

Answer 1

sometimes.
if the numbers are same.
if you want to put same constant but remember to put either small in one and caps in other

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Answer 2

Technically, the answer depends on what you mean by z, if by convention you mean the atomic number of an element, then no, every element has a unique value of z, that shows the no of protons ( or electrons if the atom is in ground state ). So the answer to that question would be a no.
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