No, the classic Creative Board will not fit in the Osmo Large Carrying Case. Only the newer Osmo Creative Board will fit in this case.
For reference, the neoprene pouch in the Osmo Large Carrying Case can also fit a compatible iPad. However, the case cannot fit both an iPad and the Creative Board at the same time without damaging the case and Creative Board.
Here is a picture of the Osmo Large Carrying Case, with the new Creative Board, for reference: