You'll find slight differences in the color shade, stitching width, etc. These are pretty minor in my opinion and I wouldn't fret about them if I were you (unless it's a totally different color like gold vs yellow).
The size of the bolts has been something lots of chargers jerseys (back to rebook) have had as issues. Definitely a disappointment. Overall the elite 51s Had a lot of noticeable differences from gamers. I feel they got the vapor elites right and much more like what players wear. Overall retail authentic and gamers will always have differences though.
The grid pattern you're referring to, are you talking about the texture of the twill under the seam?