I mean unless your union agreement has a “me too” clause (they’re a thing in union bargaining, usually it’s government unions that trigger if a separate union/bargaining unit gets a better raise or something), then you are only entitled to exactly what’s in your union negotiated contract. That’s how union contracts work.
And while a union contract is in effect, there is no bargaining or changes. The entire point is stability and predictability. If you want changes, you discuss them during the next bargaining period at the end of the contract.