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Mel,
I am not with Twisst and am just commenting here. I do not think I can answer your question specifically because I do not have easy access to past events. It might be out there somewhere but I don't know where. Most of the stuff available is predictions not historiocal data. And it would not be possible for anyone to tell you without knowing exactly when and where your observation was made. Because you say that two objects were following the ISS, it's hard to tell what you mean without some objective data (e.g., an estimate of how many degrees apart they were such as the distance between Betelgeuse and Sirius, or twice the width of the Full Moon... something like that). Given that the Grace satellites are not in the same orbit as the ISS (they are in polar orbits), it is unlikely that they would appear to follow the ISS for any length of time.