Here, the counterpart of "anupassana" is "sampajanna", and not "sati".
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“Anupassī” ti. Tattha, katamā anupassanā?
“Contemplating”. Herein, what is contemplation?
Yā paññā pajānanā vicayo pavicayo dhammavicayo, 05
That which is wisdom, knowing, investigation, deep investigation, investigation of (the nature of) things,
sallakkhaṇā upalakkhaṇā paccupalakkhaṇā, 06
discernment, discrimination, differentiation,
paṇḍiccaṁ kosallaṁ nepuññaṁ 07 vebhabyā cintā upaparikkhā,
erudition, skilfulness, subtlety, clarification, thoughtfulness, consideration,
bhūrī medhā pariṇāyikā vipassanā sampajaññaṁ patodo, 08
breadth, intelligence, guidance, insight, full awareness, examination,
paññā Paññindriyaṁ Paññābalaṁ, 09
wisdom, the Faculty of Wisdom, the Strength of Wisdom,
paññāsatthaṁ paññāpāsādo paññā-āloko paññā-obhāso paññāpajjoto paññāratanaṁ, 10
the sword of wisdom, height of wisdom, light of wisdom, lustre of wisdom, flame of wisdom, treasure of wisdom,
amoho dhammavicayo Sammādiṭṭhi – ayaṁ vuccati “anupassanā”.
non-delusion, investigation of (the nature of) things, Right View – this is called “contemplation”.
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“Sampajāno” ti. Tattha, katamaṁ sampajaññaṁ? 16
“Full awareness”. Herein, what is full awareness?
Yā paññā pajānanā vicayo pavicayo dhammavicayo,
That which is wisdom, knowing, investigation, deep investigation, investigation of (the nature of) things,
sallakkhaṇā upalakkhaṇā paccupalakkhaṇā,
discernment, discrimination, differentiation,
paṇḍiccaṁ kosallaṁ nepuññaṁ vebhabyā cintā upaparikkhā,
erudition, skilfulness, subtlety, clarification, thoughtfulness, consideration,
bhūrī medhā pariṇāyikā vipassanā sampajaññaṁ patodo,
breadth, intelligence, guidance, insight, full awareness, examination,
paññā Paññindriyaṁ Paññābalaṁ,
wisdom, the Faculty of Wisdom, the Strength of Wisdom,
paññāsatthaṁ paññāpāsādo paññā-āloko paññā-obhāso paññāpajjoto paññāratanaṁ,
the sword of wisdom, height of wisdom, light of wisdom, lustre of wisdom, flame of wisdom, treasure of wisdom,
amoho dhammavicayo Sammādiṭṭhi – idaṁ vuccati “sampajaññaṁ”.
non-delusion, investigation of (the nature of) things, Right View – this is called “full awareness”.
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“Satimā” ti. Tattha, katamā sati?
“Mindful”. Herein, what is mindfulness?
Yā sati anussati paṭissati sati saraṇatā,
That which is mindfulness, recollection, recall, mindfulness, remembrance,
dhāraṇatā apilāpanatā asammussanatā,
bearing (in mind), not losing, not confusing,
sati 17 Satindriyaṁ Satibalaṁ Sammāsati – ayaṁ vuccati “sati”.
mindfulness, the Faculty of Mindfulness, the Strength of Mindfulness, Right Mindfulness – this is called “mindfulness”.
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'Sati' acts in pair with 'sampajanna', which has led to their conflation.