Although both were made up of most/all of the land on Earth, Rodinia was much older (around 1000 mya). Rodinia broke up, and the land reformed to make Pangea (around 300 mya).
Rodinia is generally considered to be the earliest supercontinent. It broke up, and through plate tectonics (as explained by the Wilson Cycle), the land masses reformed to create Pangea. Most geological evidence only predates back to Pangea, so Rodinia has been much harder for geologists to study.
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