Lesson of the day, do not flash back to Pie on a pixel 3a that is on q
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FWIW, I flashed back to Pie from Q on a Pixel 3a XL and didn't have any issues. Not the same device, of course.
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No real difference between the bonito / sargo firmware, boot or vendor images and system image differences are minimal.
gist.github.com/thestinger/9dc
Pixel 3 and Pixel 3 XL are similar, but they use different touchscreen drivers so they load a different module. They ship both anyway.
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i.e. the Pixel 3 touchscreen driver is shipped in the Pixel 3 XL vendor image and vice versa, and I doubt there are any actual differences / incompatibilities between those. They could easily eliminate the remaining differences by handling it at runtime and use the same releases.