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Hi Aaron and welcome. The differences are the Sights, trigger color and slide ports. Congrats on the Diamondback. I have greatly enjoyed mine!
I was just jumping to to say what James already did! Good luck with your DB!!!
Hi Aaron, the only difference are cosmetic. The ports in the slide are different and 43933 has a gold trigger. The sights are slightly different, but for all intents & purposes, are essentially the same. Unless you absolutely want the gold trigger, I would go with 43916. I think the porting looks way sharper than the other model. No matter which model you choose, I recommend this charging ring. (prevents pinched fingers) https://www.budsgunshop.com/product_info.php/products_id/718014102/halo+charging+ring+for+ruger~+mkiv+%26+mkiii , Details here >>> https://www.tandemkross.com/halo-charging-ring-rugermkiii-mkiv-2245 Stay safe & have a great day!