Sorry, I don't understand your numbers.
For the yield, you are probably speaking of Specific production, expressed in [kWh/kWp]. But such a high productivity is completely out of standards.
However the Specific production doesn't depend on the Efficiency of the modules at STC.
When you install 1000 kWp of modules, the production will be related to the Nominal power, not the efficiency.
With lower efficiency, you will have a greater area, but still 1000 kWp installed ...
Now the differences in yield may arise due to the temperature behaviour
and low-light sensitivities
of the modules.
And this is dependent on specific model parameters (namely Rserie), which are not always known with accuracy.
See our FAQ What explains the difference in Yield between different modules?