I’m no handwriting expert, but they sure look the same to me. My signature certainly is identical from day to day and there seem to a few common elements that aren’t “standard”, e.g., a capital N that looks like a croquet hoop,a small n that looks like a u, a y “stem” that bends to the right instead of the left,a i that looks like Mt Fuji etc.
I do have some knowledge of handwriting , the left one appears to be wrote by a left-handed person. the right one was wrote by a right handed person. I best guess is that the “certification” document was not signed by Pelosi.
I am not an “expert” but the signatures do not match on many points.
the first N should end much lower than the line. In the first signature it does not
there should be spacing between the letters an_cy in her first name. In the first signature it does not
the capital P should be one clear fluid pen stroke. In the first signature it is not
the “e” in her last name should be higher on the line. In the first signature it is not.
The “s” in teh last name should have some loop in it. In the first signature it does not