I'm currently growing my first batch of early miss autos. One is also filling out faster then the other, but with that being said the slower one looks like it's going to be a beast of a plant when it is finished. Just figured I'd drop a comment because mine are doing the exact same thing as yours. Good luck and happy growing.
@Northnut, definitely a well structured plant. Ill tag along for your adventure so we can compare notes. Are they smelling like white widows hotter younger sisters? The sweet smell she gives is straight hypnotic. Not bad for a free sample pack from crop king I got from my hydro store. Can't go wrong with free weed.