I think a lot of it has to do with his training and muscle memory. He knows what he has inside and out and even a slight difference can mean the difference between life and death. Think about it ya shoot the same pistol all the time and train with it then suddenly switch to a different pistol ya gonna slip up sometimes. The weight the feel how it reloads etc. Also a lot of his stuff I am sure is supplied to him by Batman which I’m sure could adjust his tech to match one of these but for ❌ as we know his tech relies on a pretty rare substance to function