Yes, Rodinalhas changed over the course of history, but don't ask me for the details, I don'T think many people outside of Agfa know them exactly.
I have tried R09 - you have to adjust your dev. times, since it has a different concentration (it alos looks already like dark coffee from the start, whereas Rodinal is much lighter the first time you open the bottle). It has a few crystals floating at the bottom of the bottle (that have to be there - just like in old Rodinal); and the bottles really suck - if you get R09, fill it into a glass bottle the first time you open it, the seams on the neck where the plastic halves of the bottle are joined, tend to break and leak.
I did not find it worth to get R09 instead of Rodinal for the few cents saved, and switched back to the Agfa product.
Roman