Units are units.
A 1 here is a 1 there. Whatever “1” means to you. Inches, feet, miles, meters, millimeters, leagues.
I’m not sure your question makes sense. 5 is 5.
Now, in Blender if 5 is 5 miles and you run JME with bullet physics then it’s going to move objects around as if that’s 5 meters with the default setup… but that’s because physics cares (only a little) about such things.
Else, 5 is 5.