NO THEY ARE NOT!
If the terms of a contract change, it is no longer the same contract. If I do not sign the new contract, then I am not bound by it. I don’t even care if it was just a change of wording that doesn’t have any impact on the meaning of the terms. If the contract changes, it is not the same contract. Businesses have to realize that they are at the mercy of their customers, not the other way around. We have all the power, and they have none of it.