I use two different machines for development, a laptop and a desktop PC.
In the simulator, in the Active Memory view, I get different values for "Application Data" when I run the watchface on the same virtual device on each machine.
The SDK (doesn't matter which) is the same as well as all the Monkey C settings (compiler options etc) and the project is synchronised 1:1 via GitHub.
I noticed this a few months ago and with my latest app the difference became significant (~0.6kB). 
Also the number in Peak Objects seems to be higher, but I don't know if this is related to that "problem".
I found this thread that explains what application data is:
https://forums.garmin.com/developer/connect-iq/f/discussion/164329/active-memory---application-data
Does anyone have any idea why the size of that part is so different and maybe how to even it out?
I've done some tests on my Instinct2 -although they're not represantable- and the overall data size seems to be even smaller than what's shown in the simulator, but it's the same no matter what machine it was compiled on.
Thanks