I don’t understand your last sentence. I am not aware that the boards are EQ’ed for different tweeters. I think a new black tweeter is expected to blend with the prior model, which have basically the same specifications and are also made by SEAS, if I understand correctly.

If not I will soon stand corrected😀 In setup you will match the loudness levels.

James
NC1: 861v8, ID41, 218, 251(to outdoors), DSP8000SEUG, 7200SEC, DSP520 rears, Apple TV, DirecTV, Oppo BD103, QNAP251, Roon
NC2-M7005, Triad Silver Speakers,Acurus Amps

FL1: 861v4, ID40, 218, MS200, DSP8000SEs, DSP7200SEC, DSP5000s, DirecTv, AppleTv, OppoBD103, QNAP469, Roon
FL2: Marantz 7005, 251, M60s,60C,33s, Oppo BDP-93,MS200, Roon