[Roger]

What size Futura?
You cannot put a deep Tuttle Fin into a Standard Tuttle Fin box!
The root depth on the Std. Tuttle fin box is too shallow.
The root length on a Deep Tuttle Fin is about 18 mm too deep to
go all the way into a Std. Tuttle fin box.
Std. Tuttle fins can be fitted into a Deep Tuttle fin box very nicely
as the end tapers are the same dimension at the base of the root.
You just need 18-20 mm longer fin screws to reach down to the barrel nuts
in the Std. Tuttle fin root.
So, the answer is No!
You cannot use Deep Tuttle fins in Std. Tuttle fin boxes.
Roger