You are looking at two completely different methods of bluing/blacking plus the trigger guard was allowed to get too hot in the caustic blacking solution and has turned slightly red.
The barrels will probably never look the same as the gun furniture (base plate, trigger guard, top lever pins etc) as the barrels are cold rust blued while the furniture is hot caustic blacked or temper blued: two totally different processes.
Back in my past I tried cold rust bluing some furniture and it was not a success! And of course you can not use hot caustic on a normal soft solder constructed barrel set or you land up with a kit of parts!
