And be it enacted, That where Lands now charged or hereafter to be charged with Rent-charges or Portions of Rent-charges under confirmed Instruments of Apportionment have been or shall be (after the Confirmation of such Apportionment) inclosed or divided, allotted or exchanged, by Agreement or Award made under the Powers of any general or local Act of Inclosure (or otherwise), in such Manner that the Apportionment shall appear to the Commissioners to be inconvenient with reference to the altered Distribution of the Land among the several Owners thereof, it shall be lawful for the Commissioners, upon the Application of the Owners of such Lands, or the Majority in Number and Value of such Owners, or upon the Application of the Person or Persons entitled to such Rent-charges or Portions of Rent-charges, or any of them, to make or confirm an altered Instrument of Apportionment adapted to the altered Distribution of the Lands, in order that the Rent-charges or Portions of Rent-charges originally charged on the several Portions of Land which shall have been taken or allotted away from the former Owners on such Inclosure, Division, Allotment, or Exchange shall be charged on the Lands which shall have been allotted or received in the way of Substitution or Compensation for the Lands so taken or allotted away from the former Owners thereof, or as near thereto as Circumstances will admit; and every such altered Apportionment, when confirmed under the Hands and Seal of the Commissioners, shall be valid as from the Date of such Confirmation, and shall be taken to be an Amendment of the original Apportionment;