mkvmerge does that automatically. Make sure you actually append the two files. The difference between "mkvmerge -o out.mkv in1.mkv in2.mkv" and "mkvmerge -o out.mkv in1.mkv +in2.mkv" are subtle, but the resulting files are completely different. Same goes for using mmg; use the "add" button for the first and the "append" button for the second file.
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Latest MKVToolNix is v83.0
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