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The Pali version of this expression identifies equanimity that is diversified as upekkhā nānattā nānattasitā and equanimity which is unified as upekkhā ekattā ekattasitā.
Evameva kho, gahapati, ariyasāvako iti paṭisañcikkhati: ‘rukkhaphalūpamā kāmā vuttā bhagavatā bahudukkhā bahupāyāsā, ādīnavo ettha bhiyyo’ti. Evametaṃ yathābhūtaṃ sammappaññāya disvā yāyaṃ upekkhā nānattā nānattasitā taṃ abhinivajjetvā yāyaṃ upekkhā ekattā ekattasitā yattha sabbaso lokāmisūpādānā aparisesā nirujjhanti tamevūpekkhaṃ bhāveti
Potaliyasutta [Pali]
Following excerpt from Excursions Into the Thought-World of the Pali Discourses by Bhikkhu Analayo explains them in detail.
The unified equanimity of deeper Jhāna experience is considerably more refined than worldly types of equanimity that are based on diversity, upekkhā nānattā nānattasitā
Excursions Into the Thought-World of the Pali Discourses By Bhikkhu Analayo
So in summary,
equanimity that is diversified = undeveloped mind
equanimity which is unified = a mind at Jhāna level