I believe that bottom object in your picture is Text, yes? And if you grab a corner and stretch it, the font size kinda doesn't matter anymore?
In both groov and PAC Display, there are certain objects where the text size stays the same, and others where stretching the object will make the text bigger. I've pondered these differences for groov in this post, but not for PAC Display.
In PAC Display, you can see your X/Y, W/H values as you change the size of the object, which is handy if you're concerned about having a specific size. In groov, there's a grid which objects are snapped to. I suppose I have my most/least favorite options in each.
To answer your question, I suppose it is known, but I think the difference would be more significant on the objects where text sizes are NOT changed when you stretch the object (like a button and a table)?