Let me add my 50 cents to the issue again . I have followed the instructions, even make some more tests.
All I can say for now is that with that procedure accuracy of 3790 is in average 4 meters better than 3490 converted. I'm talking just for driving tests.
Standing still with clear sky view - no difference. Need more tests, but still they are not same.
What I have done description will follow soon, I hope .