Collecting 5th wheel Tow Data, just for fun, 2000 mile trip

Are these trucks in passing ,going the other way , how do you tell the difference from an early 6.0 to 7.3. I have learned that the only way to tell some of the earlier 7.3 Suoerduties to the later 7.3 is the badge on the front fender, the early ones were in the front of the fender the later were lower rear part of the fender, as were the 6.0 Also got to be be quick in passing to be able to tell the early 99 Superduty 7.3 from the V10, nearly the same badge on the front of the front fender. Just curious