You speak of versions and of warehouses.
The Poke5P is available out of both US and Hong Kong warehouses.
Where the Poke5 comes from, I don't know.
Code:
Model: Poke5P (English)
Finger: Onyx/Poke5P/Poke5P:11/2024-03-13_10-15_3.5.1_cb7eaef7e/7997:user/dev-keys
Link: http://firmware-us.boox.com/c07f713991056ef618ce707994b0aa70/update.upx
Size: 1,629,542,746
MD5: c07f713991056ef618ce707994b0aa70
Model: Poke5 (Chinese)
Finger: Onyx/Poke5/Poke5:11/2024-03-08_12-18_3.5.1_a84d5becc/7957:user/dev-keys
Link: http://firmware.boox.com/18673066f58eff42efd478c3513172c3/update.upx
Size: 1,623,801,394
MD5: 18673066f58eff42efd478c3513172c3
It looks like they get updated in parallel.
I would take any statement of exactly what type of film formulation is on an eInk panel on which device with a grain of salt.