Can someone help me with this problem C1. Message Transmission Error (hard version)?

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Can someone help me with this problem C1. Message Transmission Error (~~easy~~hard version)?

Difference between en1 and en2, changed 6 character(s)

I have solved the easy version of the problem. But I have no idea how to solve this one. Do I require any new algorithms? Can someone please help me solve this problem?

History

Revisions

	Rev.	Lang.	By	When	Δ	Comment
	en2		negetive_iq	2024-08-29 13:16:41	6
	en1		negetive_iq	2024-08-29 13:16:24	252	Initial revision (published)