I also tested this type of export (Export tweaked Clockskin), the resolution is closer but not exact to 320x385, but in ClockSkinMaker it doesn’t match the clock anymore! See the attached image! I understand that there is an incompatibility between Watchface Designer which is more advanced and ClockSkinMaker!?
I don’t have the watch handy right now, but I’ll try it in an Android emulator to see what it looks like in the Universal Launcher
Thank you all for the answers!