Did I see the dragon capsule on Friday night?
I have certainly watched the ISS and an undocked Shuttle Orbiter chase each other across the sky. Since they appeared to be of equal brightness, I didn't know which was which. Their angular separation from my POV was approximately 20°, so their actual separation would have been about 150km. It was one of the last Shuttle flights, so I was very lucky to see it.

It is possible that you saw the Dragon capsule, and it would certainly have appeared to be be fainter than the ISS. The easiest way to establish the fact is by using a program like Stellarium. This will show you if the ISS was visible at your location, given the date and time of day.