trk files aren't a recording of the flight, they are a recording of the input. So you replay the input, everything else gets recalculated. Including g forces. But the downside is if something is just a millisecond off early on in the track, the whole track goes wild. Reasons for a millisecond difference can be a change of views or some caching when the missions starts. Usually, when I fire up il-2 and go watching tracks first thing, the track plays differently playing it first time then it does playing it the second or third time.
ntrk files are an actual recording, essentially they record everything that's also sent via network in multiplayer games. Apparently, the g load is not transmitted and also not recorded. The format is more stable in the long run, but not quite as smooth as trk. You may occasionally see aircraft warping, which never happens with trks.
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