Regarding devas and Brahmas in this universe according to early Buddhism, the following articles on Samyuttas/Samyuktas by Choong Mun-keat may be relevant:
“A Comparison of the Pāli and Chinese Versions of the Brahma Saṃyutta, a Collection of Early Buddhist Discourses on Brahmās, the Exalted Gods”, Buddhist Studies Review (Journal of the UK Association for Buddhist Studies), vol. 31.2, pp. 179-194 (2014).
"A comparison of the Pali and Chinese versions of the Devata Samyutta and Devaputta Samyutta, collections of early Buddhist discourses on devatas “gods” and devaputras “sons of gods” ", Journal of the Oxford Centre for Buddhist Studies, vol.1, October 2011, pp. 60-88.
See also other notions of devas in early Buddhism:
“A comparison of the Pāli and Chinese versions of Nāga Saṃyutta, Supaṇṇa Saṃyutta, and Valāhaka Saṃyutta, early Buddhist discourse collections on mythical dragons, birds, and cloud devas”, Journal of the Oxford Centre for Buddhist Studies, 2020 (18), pp. 42-65.
"A comparison of the Pali and Chinese versions of the Sakka Samyutta, a collection of early Buddhist discourses on ‘Sakra, ruler of the gods’ ", in Journal of the Royal Asiatic Society, vol. 22, issue 3-4, October 2012 (Cambridge University Press), pp. 561–574.
“A comparison of the Pali and Chinese versions of the Mara Samyutta, a collection of early Buddhist discourses on Mara, the Evil One”, The Indian International Journal of Buddhist Studies, vol.10, 2009, pp. 35-53.
Check the above-mentioned articles in https://www.academia.edu/