First of all, the potential Parties to a contract can agree any change they like prior to entering into a contract. They can even agree to change the conditions of contract once they have entered into the contract.
As for your second question, I/we really can't answer that without (a) seeing what the clauses are (b) having some understanding of the project's risk profile and (c) your risk profile. I suggest you consultant a lawyer or a commercial bod with good legal understanding.
As for your second question, I/we really can't answer that without (a) seeing what the clauses are (b) having some understanding of the project's risk profile and (c) your risk profile. I suggest you consultant a lawyer or a commercial bod with good legal understanding.