I have the same parts,
but the opposite problem
my res faceplate is lighter than my aquaero one.
I was going to order a new faceplate for my res and also for my filter (current one is "silver")
but was worried i would end up with 3 diff shades of black,
so just made my own
i assume it is just due to different sheets of stock they were made from.
i am SURE Shoggy will send you a replacement.
edit: this is for project carbon right?