John, I would certainly think the curve of a 31.8/56 Albatross would be the same as the 25.4 version. I have the 25.4/56 also which I too love, whereas the 55 was a real downer as the curve radius was indeed notably smaller in-hand. Nitto should have never stopped making the 56 steel Alba.
Alternatively, someone here on the list mention Doom custom Bars, who advertises on Instagram. He can make a bar with the same shape as the Alba, or tweak it any way you want in widths and angles. They are all 22.2 cr-mo bars, requiring shims for larger stems. $100 for the bars in black, + $50 for a nickel plated version.