According to the following specs PDF from Airbus' website:
https://www.airbus.com/content/dam/corporate-topics/publications/backgrounders/techdata/aircraft_characteristics/Airbus-Commercial-Aircraft-AC-A310-Dec-2009.pdf (https://www.airbus.com/content/dam/corporate-topics/publications/backgrounders/techdata/aircraft_characteristics/Airbus-Commercial-Aircraft-AC-A310-Dec-2009.pdf)
It seems there are two missing weight variants of the A310-200 for both CF6 and JT9D engines with MTOWs of 138.6tn and 142tn which had better range performance than the baseline 132tn version.
This fleet group is often severely underused ingame, so any love it gets would go down well I feel.
I lurrrv the A300/A310 family. Did very well in an olde game from CDG to the Caribbean and South America.. TJSJ, TTPP etc