Two binary numbers returning the same gray code?

[SBUtltmedia]

Can someone please explain the following?

from sympy.combinatorics.graycode import gray_to_bin,bin_to_gray bin_to_gray('000000000000001111100111') '000000000000000110010110' bin_to_gray('000000000000001111100110') '000000000000000110010110'