Is the language within a contract IP?

Thanks for being available. I wrote a services contract for a specific service offering and use for all engagements of this type. I just received a formal Request for Proposal from one of the clients I've worked with in the past and they attached their contract for the work. The contract they attached is the exact same as my contract less my name & references. Sadly my contract includes detailed process & delivery information. (and no, I did not include the state "proprietary & confidential" at the bottom of my contracts but will now!)

So to the questions:
Is contract language proprietary? Can they use my contract as their own now for other parties?