Wow no kidding! Those second pair looks quite different! Also is the first pair Aldens? With the exception of the welt/outsole, the vamp eyelets etc look just like my jcrew alden PCTAs has been pointed out shell often results in slightly different shades between panels (more pronounced in direct light), but ideally the clicking should be done so that the left and right shoe are generally consistent with each other, even if within a shoe itself there is variation. You can see the shell boots I'm wearing today (from another maker but worn in honor of the shell mismatch theme discussed here) have different panel shades but they match across left and right foot.
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I have another pair from Carmina where the two shoes are entirely different colors -- these were sold as seconds
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