First step would be checking both cubs to see if they have any adults mutations, you can do this by clicking on the cub, selecting 'Not checked' next to the mutation section, you will be taken to a page where you have to pay a fee to check to see if they have a hidden mutation or not. If they do, great! More money, if not, I would price them around this range each:
Pewter cub: 40sb (fodder for the gorilla basically, none of their slots are rare markings, and the base is common, plus they're dirty)
Auburn cub: 60sb (He's clean, which means no inbreeding in their heritage at all, so that bumps up his value, none of his markings are rare most of them are in common slots too.)
Used this page to determine how rare certain marks are in certain slots (shows the amount of lions in game with that marking in that slot) https://www.lioden.wiki/raffle-marking-slot-rarity#vitiligo

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Thanks for the references and estimate prices. I may just use them both for gorilla fodder then. BTW, which marking slots are considered "common" and which are uncommon/rare?

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No problem! The link I gave should show which markings are rare in their respective slots :) I'd say (personal opinion) that a marking could be considered rare if it's below 70 lions on the site, mainly because a lot of people don't realise the markings are rare, and just throw them off as fodder or throw them to tree :) Any markings that you can get from a marking applicator are pretty much worthless unless people are actively seeking them out to breed

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