It is not possible to have two valid Bitcoin addresses that differ only in their last 5 characters at all, as those only contain checksum data. For bech32/bech32m addresses (bc1...), that's even true for the last 6 characters.
In theory, it is possible to construct two P2PKH (1...) or P2SH (3...) addresses that differ only in 1 character if not at the very end, but the probability is very low that any given addresses has such a valid mutation (1 in ~75 million). With bech32/bech32m any two valid address differ in at least 5 characters.
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