Missing Dhyana/Jhana Sutras? Are there parallel texts between Pali Canon Jhana Suttas, and Mahayana equivalent? Dhyana Sutras? I now that the theme is picked up again in Tiantai texts, but I'm thinking of between the Pali canon and the Tiantai? Does Asanga touch on this topic or skip over it? Kumarajiva?
Yes some texts of the pali canon have parallels in what people call the (chinese) agamas.
The links for the agamas is here:


Where can I find the Chinese Canon Agama in English translation?


Some people compare the agamas and the nikayas:


The Fundamental Teachings of Early Buddhism -- 
A comparative study based on the Sutranga
portion of the Pali Sarpyutta-Nikaya
and the Chinese Sarpyuktagama
by Choong Mun-keat (Wei-keat) 


... for instance, chapter 7 ...



... with the most famous one about breath mediation here:


Translations from the Taishō Tripiṭaka


bikkhu analayo is the most famous bikkhu for this kind of comparision:


Prof. Dr. Bhikkhu Analayo


Many of the Mahayana and Vajrayana sutras (chinese or tibetan), however, have no parallel in the pali suttas (i.e. they're unique to Mahayana or Vajrayana):


Chart Comparing Pali, Chinese and Tibetan Canons