Wingless Walrus - the FA2 carried 5000lb internally and with 190 gallon tanks a total of 8000lb. I think that ‘Mogwi’s bunch’ in ‘82 used the 100 gallon tank which gave you a maximum of 6600lb.
For the chart to be right then the GR is indeed on internals only....and even then I’m not sure the figure for either is right in an operational sense.
The real world has a habit of making the differences less stark than the ODM or simulation would have you believe!