If you asked these two teams how important this game is I bet the Eagles will overall believe it is more important for them. Everyone is viewing them as the #1 or #2 team in the NFL. If they beat the Cowboys they validate those assessments. If they lose to the Cooper Rush led Cowboys they look like pretenders. I believe the Eagles will enter this game as fired us as any team for any game that is not a Super Bowl. If the Cowboys weather the early storm, they will have a chance to win the game. This is a prove it game for the Cowboys defense too. The Eagles will try to run on they and use play action with their receivers against the Cowboys secondary. The Eagles are by far the best offense the Cowboys have faced so far this year. It is a test of legitimacy for the defense and the pass rush.
This is also a prove it game for Cooper Rush. The Eagles are going to make him win the game. I think the Eagles will go all out to stop the run and force Rush and the Cowboys receivers to make plays. The Eagles will let their CBs cover the Cowboys WRs while committing a safety to stopping Zeke and Pollard.
But, I have said for years the NFL is all about healthy players. The teams with the most healthy starters at the end of the year have a huge advantage over everyone else. The Eagles are healthy right now, the Cowboys are not, but so much can happen in 12 games. When these two teams play again later in the season, it could be the Eagles missing key starters, while the Cowboys are at almost full strength. There is a reason only 1 team has gone undefeated for an entire season.
I think these two teams will face each other 3 times this year. So there is a lot of football still to be played.