There's little splitting the two boy groups, other than the amount of singers in each, and the pair of acts are going head to head both on and off stage.
No doubt District3 - formerly GMD3 - feel a bit annoyed that they've somewhat been eclipsed by a group formed by the judges.
Despite being together for years, District3 have been overtaken by Union J, who were put together by Louis Walsh at judges' houses.
"The calibre of the boybands this year is very high. The lads all want to be the new none Direction, and there is a lot of tension backstage to get the look and the sound exactly right," a source said.
Speaking to Star magazine, the supposed insider continued: "Union J were partly put together by the judges - just like 1D were.
"The guts from District3 think they have a clear advantage over them because of this. They don't wan to be seen as weak as a three-piece band in comparison."
Both groups struggled on last weekend's first live show, but managed to avoid elimination.
This weekend they'll both need to bring it out of the bag to not only impress the judges, but also the viewers.
The X Factor 2012 continues this Saturday night on ITV1, with the results show following on Sunday night with performances from Taylor Swift and Rebecca Ferguson.