Hi Steven, the difference is CA020 has a blued finish and CA20C00 has a charcoal blued finish. The Charcoal finish is more grey and more dull in appearance than the blued finish. It's hard to see in Bud's picures.
Blued finish >>> mpactguns.com/Black-Powder-Pistols/Cimarron-Firearms-1847-Walker-Dragoon-44-Caliber-9-Blued-Barrel-Walnut-Grip-814230011503-CA020/
Charcoal blued finish >>> mpactguns.com/black-powder-pistols/cimarron-1847-walker-dragoon-44-cal-9-barrel-charcoal-blued-6rd-844234105458-ca020c00
Put an I in front of each link (Bud's won't let me post the full link)
Stay safe & have a great day!

It might possibly be a price difference due to stock on hand at Buds because as far as a Difference between the 2 models, I couldn't find any.

Hi Steven and welcome. Someone likely fat fingered the model and created 2 listings for the model. Buds prices are tied to stock level so the lower priced model likely has more units in stock over the other making the price lower. Cheers, stay safe and enjoy!