Perhaps, but not more so at one place over the other. I would say I have been a pretty solid customer at both nbk and yy for a few decades.
I will say the staff at nbk is a lot more accommodating, less harried and friendlier than yy. But I truly don’t think that it is any different for regulars or newbies.
Here’s what I mean. I have a buddy who is a true “regular” at yy. He goes at least 2x a month, and takes out weekly as well. And he owns a building further North on Sawtelle, near Plan Check. And he has thrown a small party there for their Duck Shabu Shabu which I reported on previosly Holy Duck - Go off menu and try the Duck Shabu-Shabu at Yakitori-ya - Los Angeles - Food Talk Central
Yet, he tells me how they ignore him, almost always, for a good twenty minutes after seating. That is their m. o.