If at any time after the final town planning scheme comes into force,

the appropriate authority is of the opinion that the purpose for which any land is allotted in such scheme under any of the paragraphs (ii) and

1. (iii) of sub-clause (a) of clause (jj) of sub-section (3) of section 40 requires to be changed to any other purpose specified in any of the said paragraphs, the appropriate authority may make such change after following the procedure relating to amendment of regulations, specified in section 72 as if such change were an amendment of regulations.]

another scheme.