A person obtained a proxy Hajj from one, but without the condition of allocating the proxy pilgrim. The proxy…

A person obtained a proxy Hajj from one, but without the condition of allocating the proxy pilgrim. The proxy pilgrim obtains a higher price, is it permissible for him to agree with another person to perform first proxy Hajj and he takes the second proxy hajj? Or is he required to inform the one for whom proxy Hajj is going to be performed, notifying that this person will not object that because the important thing is that he has some to perform Hajj on his behalf?