.44 Spl. dies will reload .44 Mag.
.44 Mag dies will not load .44 Spl.
The same applies to .38 Spl. dies.
They will also load .357 Mag.
But .357 Mag dies will not load .38 Spl.
Nowdays, the die makers have gone to one common die set to load both.
In the old days, you bought the Spl. dies and used them on both.
rcmodel