I bought some variegated dk sock yarn a few years ago...abut 17 skeins of it in fact...Atacama Araucanian...I guess kettle dyed or hand dyed...anyway...when I finally got all 17 "identical" hanks wound up into 'cakes'...I could clearly see that I had 4 different colorways...all the same color number mind you...and maybe the same dyelot...but BOY O BOY...the 4 'batches' were all so different in intensity, and some had more rust, some had more gold, some had more grey...I just bagged it. Made some hats for DH, and still have a bunch of it. It might do for socks...but...I think I could also have two socks that are slightly different like yours.
BTW, I think your socks are MAGNIFICENT! Thanks for modeling for us!!!!