Fujifilm 400 (made in the USA) vs. Kodak Ultramax 400 - The Same, or Different? - 35mmc

I can't help but arrive at these two film stocks appearing so close in results that I might as well think of them as interchangeable.

For science I pushed rolls of Fuji 400 to 800/1600 and here are the unedited results. : r/AnalogCommunity

The Best Affordable 35mm Film

Fujifilm 400 (made in the USA) vs. Kodak Ultramax 400 - The Same, or Different? - 35mmc

Fuji Superia X-TRA 400 vs Kodak Ultramax 400 Film Stock Comparison » Shoot It With Film

Comparing Fuji 400 (Made in USA) to Kodak Ultramax: Are they really the same?, by Robin Férand

Fuji 400 what is it? Ultramax 400?

Comparing Fuji 400 (Made in USA) to Kodak Ultramax: Are they really the same?

Comparing Fuji 400 (Made in USA) to Kodak Ultramax: Are they really the same?, by Robin Férand

For science I pushed rolls of Fuji 400 to 800/1600 and here are the unedited results. : r/AnalogCommunity