It appears so, except for the missing SupportList entry in the OpenWrt images.
This might be a Belgium specific regional variant of WPA8631P v3?
Inspecting the only available firmware wpa8635pv3_fr-up-ver3-0-0-P1-20210625-rel39993-APPLC.bin from here shows the WPA8631Pv3 EU is supported by this firmware:
$ strings wpa8635pv3_fr-up-ver3-0-0-P1-20210625-rel39993-APPLC.bin | grep -A2 SupportList
SupportList:
{product_name:TL-WPA8635P,product_ver:3.0.0,special_id:46520000}
{product_name:TL-WPA8631P,product_ver:3.0.0,special_id:45550000}
And and the partition layout is the same as WPA8631P v3:
$ grep -ao "partition .*$" wpa8635pv3_fr-up-ver3-0-0-P1-20210625-rel39993-APPLC.bin | md5sum
0771948573fffa726b8927ca6259ea16 -
So if we add the TL-WPA8635P to the TL-WPA8631P-V3 supportlist in tplink-safeloader.c it would probably work.
However there could be some other unknown as-yet-unsupported hardware differences that would cause this device to become bricked with this firmware, which would require opening up the device and reflashing it with an SOIC-8 clip. Unless you are willing to risk your device like this, we can wait here for someone else to come along and try it. There is also this outstanding issue which may also apply to the flash memory in this device. After that issue is fixed, I will make a test firmware adding WPA8635P v3 that someone can test.