Yes, for you FIRST foilboard, you can use a bigger board that could work as a surffoil and a kitefoil.
Later you might be able to use the board in marginal winds too, where size and volume is essential.
BUT, you might end up never using the big chunky surffoil with a kite, when you have learned, and found the sweetness of small boards
Experienced riders have looked for the same combo surffoil+kitefoil board one for all, but those I know havent found any
If you are an extremely good surfer you might be able to use a surffoil board so small (and light) that it could work fine for kitefoil too, but not many will be able to IMO