Is a static cling a lot easier to apply to an approx 4 ft x 4 ft shower glass? Is the adhesive called dusted the exact same opaqueness?

The adhesive films install the exact same way as the static films. They can be extremely sticky though, so you need to make sure you start using the soapy water immediately on the film and then glass once you have begun to peel the liner off the back. Those 2 films have the same look and opacity.