Found those in my stash, just tried to see if they would work with rpi-rgb-panel.
Of all address types, 0 is the closest one
root@DietPi:~# ~/rpi-rgb-led-matrix/examples-api-use/demo --led-slowdown-gpio=5 --led-rows=16 --led-cols=32 --led-show-refresh --led-scan-mode=0 --led-row-addr-type=0 --led-panel-type=FM6126 -D0
Obviously the pixel order is off, and I found this comment on amazon
https://www.amazon.com/Outdoor-Waterproof-320160mm-RGB-Full-P10-320160mm/product-reviews/B07GGXFRWF/ref=cm_cr_dp_d_show_all_btm?ie=UTF8&reviewerType=all_reviews
which recommended using GitHub - 2dom/PxMatrix: Adafruit GFX compatible graphics driver for LED matrix panels
which in turn has mapping for some weird panels like this, apparently “zaggiz” for this one, and indeed you can tell that every 4 lines, the pixel order is inverted.
They do look very nice and bright 
I don’t have an outdoors project that needs those in such a low resolution, but I can see some applications for them
I don’t really have a need to make those work with rpi-rgb-panel but I figured I’d post this to help others if they get something similar.
That said, it shouldn’t be more than a few hours of work to make a mapping for rpi-rgb-panel for someone who cares