Al-Muzzammil · Al-Insan

73:19 says 'fa man sha'a attakhadha ila rabbihi sabila' while 76:29 says 'fa man sha'a ittakhadha ila rabbihi sabila' — a subtle difference in verb form (attakhadha vs. ittakhadha).

Al-Muzzammil · Al-Muddaththir

Both use 'fa man sha'a attakhadha ila rabbihi sabila' (let whoever wills take a path to his Lord) in near-verbatim form at the close of Al-Muzzammil and Al-Muddaththir.