Paste one text on each side and compare line by line. Green is added, red is removed, line numbers aligned — you can see exactly where two configs diverge.
Notes
Comparison is line-level; character-level changes inside a line are not highlighted.
Above ~4M DP cells it degrades to positional pairing and says so instead of hanging.
Trailing newline differences are ignored; CRLF and LF are treated as equal.