I wouldnt count on it
If you kitesurf with the "slower" style and bigger boards, and you are a killer surfer (experienced and in shape) - then you can use the same board for surf and kitesurf
But for most, there is a difference, and you can not use the same board.
At least not possible if a newbee in surf, thats for sure.
And for many (most ?) experienced, the kitesurf and surfboard is not the same.
Then you find some that CAN use the same board as said, also on this forum - so it is definitely possible, indeed, but in most cases not good