Bhagavad Gita · Akshara Brahma YogaChapter 8, Shloka 13 (8.13)

Shankaracharya. Om iti ekākṣaraṃ brahma brahmaṇaḥ abhidhāna-bhūtam oṃkāraṃ vyāharan uccārayan tad-artha-bhūtaṃ mām īśvaram anusmaran — uttering Om (the name of Brahman), and remembering what it means — me, Ishvara. Importantly: tyajan deham iti prayāṇa-viśeṣaṇārtham, deha-tyāgena prayāṇam ātmanaḥ na svarūpa-nāśena — "leaving the body" — the departure is the leaving of the body, not the destruction of the self.

Acharya Ramanuja (8.12–8.13 combined). Om iti ekākṣaraṃ brahma mad-vācakaṃ vyāharan vācyaṃ mām anusmaran — uttering Om, the word that names me, and remembering me, the one named; the fruit: yāti paramāṃ gatiṃ prakṛti-viyuktaṃ mat-samānākāram apunarāvṛttim ātmānaṃ prāpnoti — he attains the self freed from prakriti, of a form like mine, from which there is no return (kaivalya). Then: atha jñānino bhagavad-upāsana-prakāraṃ — now the method of the wise one (8.14).

The difference: "The supreme goal" — Shankara: attaining Ishvara / liberation; Ramanuja: for the seeker of kaivalya, attaining the pure nature of the self.