So I tried using Google reverse image search on that pale blue seal and received entries that contained no images but returned links to articles about Obama.
So then I searched Google for presidential seals.
Out of a line-up of various images of the presidential seal, I saw one that looked like the pale blue centered one on the left, used at the recent rally. That image was linked to a Washington Post article dated 10/7/2018 titled: What You Need To Know About The 25th Ammendment.
However, it's impossible to pull up that article as it's been deleted.
What You Need to Know About the 25th Amendment - The ...
And searching that same Google link for the pale blue centered presidential seal just now - I couldn't find it....maybe it's just me; I am tired tonight.
I can't tell if that's the same color blue in the center but the search engine I used compared the two favorably. I went back to find out why searching on the emblem in the photo of POTUS at the rally brought up links re Barack Obama. Well, there is a picture of the OBama's with what looks like the same seal in an article dated Jan 2019.
Maybe there's a simple reason for the color of the seal - season or commemoration etc.; I just don't know.