Al-Infitar · Al-Inshiqaq

Both describe the sky splitting open — 82:1 uses 'infatarat' while 84:1 uses 'inshaqqat' — two verbs from different roots with overlapping meaning.

Al-Inshiqaq · Al-Inshiqaq

84:7 'fa amma man utiya kitabahu bi yaminihi' and 84:10 'wa amma man utiya kitabahu wara'a zahrihi' are the parallel conditionals in Al-Inshiqaq — right hand vs behind the back.

Al-Haqqah · Al-Inshiqaq

Both describe the person receiving their record in the right hand with 'fa amma man utiya kitabahu bi yaminihi' — the continuation differs between the two surahs.