I've just tried it again with a 1x1 km square, around the coordinates of 300 000, 6 000 000 (X,Y or easting, northing):
I set the units to metric, set the datum to NAD83 zone 14;
exported it into a shape file (lines);
opened a second drawing and set the units to metric, the datum to Lat./Long.;
exported it into a second shape file (lines);
opened a third drawing, set the units to metric, the datum to NAD83 zone 15;
imported the second created shape file into this drawing;
Now I have a 1003.8 metre by 1003.8 metre box at obviously different coordinates. The coordinate shift is understandable, but what's going on with the dimensions?
From what I gather from my original results, I placed incorrectly it at 6 000 000, 300 000. But this still doesn't explain the alteration of the size of the transformed box with the correct coordinates in the original placing.
wtheck?