Default Moto G vs. Moto G Differences

I'm about to order my second Moto G (16gb, US GSM) identical to the first one I pre-ordered. Unfortunately, my clumsy ass dropped my unprotected Moto G face first into the concrete cracking the screen. Not the G's fault...my stupid fault. My question is this: My first Moto G was from the first "batch" produced. Are there any minor differences between the first round of Moto G's released and currently shipping G's? Sometimes minor things will be tweaked from batch to batch like the display calibration or even very minor hardware changes from one vendor to another vendor. Just wondering if anything like that has happened that I should be aware of.