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C++ (gcc), (削除) 148 (削除ここまで) 142 bytes

#import<queue>
#define q[o[i/z]*z+o[i%z]]
using V=std::vector<int>;int f(V m,V o,V&r,V&R,int z){int i=z*z;for(r=R=V(i);i--;r[i]=m q)R q=m[i];}

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Thanks to @ceilingcat suggestion to use #import <queue> instead of <vector> which mysteriously brings std::vector