False. If anything, the 6.2 has significantly less reciprocating valve-train mass.
The 7.3 also has a timing chain running on nylon guides with a hydraulic tensioner.
The 7.3 didn't go with pushrods for any technical benefit other than reduced physical size, less cost and the low RPM range of the engine made OHC less beneficial than in other apps.
The 7.3 scaled down to 6.2 wouldn't be much to talk about.