Hello all! I bought a starter of the Call of Cthulhu CCG a while back. I then bought the LCG starter. Now I probably won't be playing in any tournaments, but if I ever do get a wild notion to do so, are the CCG cards legal?

They are not. You can use them in casual play if it's OK with your opponent, but they aren't considered legal in the LCG.

You can however use CCG cards that are identical to their LCG equivalents, assuming you have them in opaque sleeves.

Reprinted cards can be found in the core set, the Secrets of Arkham expansion and the Forgotten Lore Asylum Pack cycle.