All of the sky interior aircraft retained their original seats during the reconfiguration. So, yes, the Borghetti era ones. They are now in the process of being reupholstered to match the ribbed style of the new seats found on the MAXs and older 800s. Much needed IMO. The old purple, grey and red mixture is looking a bit long in the tooth.
I don't think this is necessarily a bad thing. The older seats are arguably more comfortable than the new ones and they were pretty clear from the start it would be new or refreshed economy seats.
One positive is they now have fleet-wide in-seat power.