For evening I'd stick to a shorter length. They look better over long and trousers. If you usually wear cocktail dresses it will depend on the shape of your preferred style of dress.
The blue is a dyed cross-mink with a short collar, browns are usually natural (the one's shown look demi-buff and one you've shown has a stand up collar and the other seems collarless. So they are a bit different. I suspect the longer length has bracelet length sleeves and not full.
To make the new one more different you could go for a contrasting and more glam collar (and/or cuffs) in fox, contrasting shade of mink or sable. You could also have a detail like buttons rather than clips or some other feature with the closures. You could also go for one to the knee that's belted and has more swing...the possibilities are endless.
Thank you papertiger! You seem to be an expert on everything in these forums . I actually didn’t know there’s a difference between full length and bracelet length, I just knew I don’t like 3/4 sleeves. I think bracelet length would be good for evening, my blue coat has really long flared sleeves that cover my hands if I have my arms down at my sides. For evenings I usually wear cocktail dresses and the occasional long dress. Do you think it looks bad if the coat is longer than the dress?
I think I would look at different styles of collars and buttons to differentiate it from the first one and maybe a belt. I like the cuffs idea but I’m worried I won’t be able to wear I casually then. Maybe on another coat in the future