Yep, the Rollei Retros are cut from AGFA's last APX mother rolls, so Retro 100 is APX100 and Retro 400 is APX400 (be aware that the 120 versions of the Rollei Retros are cut from mother rolls that were intended by AGFA for sheet film, so the base is slightly different from AGFA produced 120 emulsions, and the dev times vary a little.)
Rollei work closely with MACO, who manufacture most of the films for them, and AGFA's Belgian R&D department, which is still on the go having been spun off into a separate company years ago.