Regarding the teachings or philosophy in EBTs based on both Pali and Chinese versions, the following books by Dr. Choong Mun-keat may be useful:
-
The Fundamental Teachings of Early Buddhism: A Comparative Study Based on the Sūtrāṅga portion of the Pāli Saṃyutta-Nikāya and the Chinese Saṃyuktāgama (Series: Beitrage zur Indologie Band 32; Harrassowitz Verlag, Wiesbaden, 2000). (PDF) The Fundamental Teachings of Early Buddhism: A comparative study based on the Sutra-anga portion of the Pali Samyutta-Nikaya and the Chinese Samyukta-agama | Mun Keat Choong - Academia.edu
-
The Notion of Emptiness in Early Buddhism (1995; second revised edition, Motilal Banarsidass, Delhi, 1999). (PDF) The Notion of Emptiness in Early Buddhism | Mun Keat Choong - Academia.edu