Redmi AX6S/RB03 and Xiaomi AX3200/RB01 are the same hardware. The only thing they are different is how they are locked to the stock firmware regions. But only the AX6S/RB03 has a reproducible way to enable telnet access to unlock it. So the OpenWRT images are the same for both models. So Yes, you can instal the same OpenWRT image on both RB01 and RB03 if you manage to get telnet access.
Sorry about "formosura". I meant "for sure", already fixed that typo. I'm replying from my phone and the automatic correction picked the wrong word.