You may find this interesting reading. It may explain the similarities. (I was already generally aware of the common ownership.)
I know people who have eaten at Park and liked it. I may have eaten at Grafton Street a long time ago, but if so, it was unmemorable. I’ve eaten at Russell House T several times and generally liked the food, but I dislike the downstairs room enough that I avoid eating there if that’s where they are going to seat me. Not a lot of use to you, I know, but on the plus side it will encourage you to succeed where I have failed, and actually carry out the experiment you plan.
My regular visits to NY begin again next week, so I’ll probably not be able to participate, but if you message me the schedule I can see if anything works.
