How do the speeds compare against the Max speed given in the drone's manual or specs ?
I suggest you upload both sets of .txt flight logs AND, if you have them, the .DAT flight logs to here. All of those logs are recorded on the phone attached to the controller.
If you do not have the DATs then ensure that "syncing logs with DJI," is switched off and perhaps also switch the phone's WiFi off, then fly another set of speed tests.
DO NOT do another set of lift tests, I worry that you might cook the motor ESCs doing lift test.
Once you have all 4 logs from the new tests also upload them to here.
Speed is a function of the drones' tilt and any headwind. Ignoring differing headwinds, it might be that the drones are running differing firmwares that set differing tilt limits. Firmware versions might be recorded in the txt flight log or available via that fight log.
With regards to lift capacity, where both drones using the same make of props ? Actually I would go as far as using only one set of props for these tests and moving them from one drone to the other during these tests.
There are reasons I am asking for the DATs but this post is already long enough.