Dear Bill,
I am just so happy to be able to contribute the teeniest bit of information to this forum, I have gained so much from everyone here.
Since you put your studio address on this thread, I will send you a sample of what I just got from Benjamin Moore. You might find it interesting to compare it to what you've got.

I'm sending the two paint chips to Garth, we'll see what his spectrometer thingamajiggy says.
Joan