As you have guessed, "Original" means unedited. I copied each track directly into BaseCamp, renamed it immediately (so there would be no question as to where it came from), and then exported it directly to GPX. As noted, I did edit the 66i tracks from previous months. Here are the original files. Unless CalTopo changed the data somehow (it shouldn't have, since I didn't edit anything there), these should be identical to what you already have.
Hike 1 Larch Mtn 6-May-23.zip
Hike 2 Eagle Creek 6-May-23.zip
Hike 3 Eagle Creek 20-May-23.zip
I too was surprised at how close the elevation values were (when checking them in the field). On the other hand, these all use barometric altimeters for tracking elevation, after the initial auto-calibration from GNSS elevation at the beginning of the track. Therefore they should be very close if the hardware is working correctly. I've previously noted virtually identical elevation
gain figures from my friends' eTrex or Oregon units, which also have barometric altimeters. For example, on a hike from Shorty's Well to Telescope Peak, with around 11,800 ft. actual gain, the 66i and a different unit with altimeter (Oregon series?) both gave overall gain within 100 feet of each other (I think the trip meter showed 10,500 while the track was higher). For the gain to be almost identical, the elevation value at any given time must also be very consistent between units.
You do not have the required permissions to view the files attached to this post.