Will I get bill if I activated Pre-Order for more than 1 variant of the same product?

The app will only charge you if you had selected your second product. If variant is for the same first product, it will not charge you. 

The app will only charge you if you had selected your second product. If variant is for the same first product, it will not charge you. 

To learn more on how billing works, please refer to the following FAQ:

Why am I billed when I only have 1 item selected for Pre-Order?