Separation of Methanol-water in a plate distillation column
Yes, you can do that.

Specific gravity is considered as unitless ratio of density related to water density.

Density as a specific mass is mass per volume, in $\pu{ g/cm^3}$ or $\pu{ kg/m^3}$

Regardless of country specific quantity naming convention:

Numerically, for 3 valid decimal digits,considering value uncertainty, the unitless quantity and quantity in $\pu{g/cm^3}$ are about interchangeable at $\pu{20 ^{°}C}$, as water density is near $\pu{0.9982 g/cm^3}$