AppleCare using lower quality retina displays when repairing?

Question

so last month, my mid-2012 retina display starting showing signs of banding. i was out of warranty, so i paid apple to fix the problem and they replaced the retina display. after bringing it home, i noticed that the colors weren't as vibrant as they were before, so i compared it to my sister's retina model (same exact model and build), and my assumptions were correct. the colors weren't as vibrant, and blacks seemed lighter; it seems as if the backlight was turned way up.
i reinstalled os x in case any default color settings were changed and played with the advanced calibration settings, but i can't get it to match the display on my sister's computer. the problem is definitely with the hardware.
i tried my best to take a picture of the two side by side to show you guys. both computers are plugged in running on full brightness with the exact same color settings. the display on the right is my sister's. it has deeper and richer colors, and you can more easily make out the details of the surface of the planet. the display on the left is the one apple just replaced, and it seems a little whitewashed with much poorer contrast.
i have 90 days after the work was completed to bring it back to the apple store in case there are any issues. is this something i can have fixed/replaced, or will they just tell me something along the lines of "tough luck, we can only replace it with the parts we have on hand"?
i'm sorry if this seems like a small detail i'm griping about, but i paid around $2000 originally and hundreds more to have the screen replaced, so i'd at least expect the same quality.

Answer 1

i have seen that thread, and from everything i've read samsung screens are supposed to have better image quality and no image retention issues, but the fact of the matter is the samsung screen i own has poorer image quality than the LG screen i had before. if you look at the post by user Bradsop on August 7th at 11:40 AM, he had this to say about the replacement samsung screens:
"Most replacement screens have been Samsung, some of those have other issues such as color, but there is no guarantee that your replacement screen will be Samsung. But anechdotal evidence from the posts here suggest that it is likely, if you replace the screen only, it will be Samsung."
so it appears as if someone else has noticed as well.
i have owned multiple pioneer kuro displays and high end computer monitors, so i understand the nuances of dynamic contrast, black/white levels, and color accuracy fairly well. today, i even showed a few friends of mine (who also own mbp retinas) if they noticed anything strange about the display, and they were able to easily tell that the display was way too bright and the colors faded.
if the samsung displays are truly supposed to be better than the LGs, i would want a replacement. i paid apple $700+ to replace a screen with banding issues, and in turn received an inferior display. judging from apple's initial reaction to the LG fiasco though, i doubt they'd be willing to replace the screen.