The Jacksons Victory and the Dynamite album were both being recorded simultaneously at Can-Am and Soundcastle with the same team of engineers. The same is true for Janet's song Don't Stand Another Chance from Dream Street. All of the Jackson brothers (except Randy) sang background vocals on the track. I think DSAC was actually John Barnes' first collaboration with the Jackson family. I also wondered if some of the songs on Dynamite were considered for Victory, and vice versa. But then again, Jermaine's involvement in the Victory album didn't occur until late during the process. In fact, Torture is his only contribution to Victory, and that song was originally meant to be a duet with Michael and Jackie. Jermaine didn't record his vocals until at least March 1984 (according to a newspaper or magazine clipping). By that time, he was practically finished with the Dynamite album, so I think it's pretty unlikely that Dynamite had any Victory outtakes.
On a side note, Jermaine also produced a song called All We Have is Love that was supposed to be a duet with Janet. Record label interference caused it to be scrapped, and it was given to Howard Johnson (without his knowledge). The song almost ended up on Dream Street, as Janet mentioned in a magazine interview. I'd love to hear the version with Janet. I wonder if Bill has a mix of the song with Janet and Jermaine's vocals, and if he has the session dates for DSAC.