Not wanting to argue with bc1023 but the difference is forged hand ground parts requiring a lot of fitting vs cnc machined from the finest billet available. Less hand fitting required. The cylinder turns a different way. The cylinder will now swing out farther to allow the use of a speed loader. Everything is made in house except the barrel inserts and the grips. Not so with the older Korth.
The new Korth still has a roller trigger that is adjustable from outside. The cylinder notches have been moved to make the cylinder stronger.
In some respects the Lollar Korth is superior to the older Korth in my opinion. All internal parts are the same. Not totally different just upgraded. Im sure someone will be along to correct my terminology or opinion. I still believe the new Korth is the best revolver in production today.