Thanks to this thread, I currently have two different versions of the developer that used to be known as Agfa Rodinal: (1) Rollei R09 One Shot, and (2) Adox Rodinal. They're both fresh. I bought the Rollei in July 2022 and Adox in October 2022. I ran a rough test using a 40 minute semi-stand development (1+100) with Arista Edu Ultra 100 in 120 size (also fresh). I agitate continuously for the first minute, then let it stand in a water bath for 20 minutes, then two inversions, then 20 minutes stand (41 minutes total time in developer). Stop, fix, and wash normally - all at 20C.
Why semi-stand? No reason other than I've done some of it in the past and I liked the results. Arista Edu Ultra 100 seems to respond to this type of processing well, with even development, low B+F, respectably small grain, good detail, lovely tonality, decent film speed, and, importantly, repeatable results.
Are the two versions of Rodinal identical? I have no idea! All I can say is that, in this particular test, they perform similarly. Why no actual photograph? I have no way to scan film at the moment, other than with my phone, which gives terrible results. Sorry about that!