Yes, it does matter.

Yes, the design of these c-shaped products ensures targeted G-spot stimulation and external clitoral vibration for enhanced pleasure during intercourse, therefor it is relevant how they are inserted. 

G-spot Stimulator: The smaller end is scientifically designed to target the G-spot effectively.

Clitoral Vibrator: The larger end serves as the clitoral vibrator and houses the control button, which should always remain outside the body.

This configuration maximizes stimulation to both internal and external pleasure points, ensuring a satisfying experience.