Grateful for help and with kind regards, Tord
The following might be of some value:
That is or was difficult.
Other people have tried what you are trying to do (i.e. compare sutras with the Pali versions). To find whatever work they have already done, you might search for papers about the specific named Sutras.
In his book A History of Mindfulness in 2005, Bikkhu Sujato (who compares Nikayas with Agamas) wrote,
The translations are from various sources. Research was carried out in many places—monasteries, libraries, Buddhist centres, internet—and I am not able to standardize or to check all the references.
However, see Chinese Agama texts are now on SuttaCentral posted in 2014.