Regular FSD rate has the driver (you) monitoring the car so there will be less accidents IF you properly stay attentive as you're supposed to be.
The FSD rides with a saftey monitor (passenger seat) had a button to stop the ride.
The driverless and no monitor cars have nothing.
So you get more accidents as you remove that supervision.
Edit: this would be on the same software versions... it will obviously get better to some extent, so comparing old versions to new versions really only tells us its getting better or worse in relation to the past rates, but in all 3 scenarios there should still be different rates of accidents on the same software.