Okay, here's my take:
Wait to open any and all for the time being.
If you can send or post scans of both, that would help too. I have heard of this and seen some really lame images, but no nice ones. This would help me in terms of checking around at different sites and sources to see which they have images of. This usually helps to uncover the rarer of the 2.
If the smaller came first, then I assume it will be the more rare of the 2. Unless they made this change late in the production run, the first version is usually the more rare. So it depends on when they made the change in the production run.
Things need to play out a little further to tell. We still aren't too sure which head sculpts on the rebel sodier or imperial officer are least common. At this point, both are pretty rare due to shipping problems and overstock in most areas.
All the early 2003 figures are going to be pretty decent items to have as time goes on because a lot of markets and areas just haven't seen any and by the time they do, it will be later releases and the early ones will have just skipped by most of us. I personally can say I've seen a total of 9 2003 figures in Colorado so far. We are dry. I know Colorado is not the only area that is suffering.
My advice is just be patient and wait to open until things settle a bit. I'll keep looking into the Fett and post if I hear anything...