More often than not I would expect a smidge better depending on the caliber twist you select. I purchased a 6mm 7.5 twist drop in barrel chambered in 6mm ARC. What can I say other than very pleased. Very accurate & easy clean up.
They had lost a considerable number of buttons used in rifling the barrel. I am of the opinion that most if not all of the updated buttons are producing a improved rifling configuration that is generally easier to clean up. If you get them on the phone I expect they can steer you in a favorable direction.
When I spoke to Stan Taylor at Douglas several years ago, IIRC, he regularly ground new buttons for new batches of barrel steel. Apparently, the "spring back" after pushing the button through the bore would vary from batch to batch of steel. Not saying all buttons for all batches. But got the impression it was fairly common to need to grind new buttons when they got a new heat of steel...