An version occurs when that masking is removed. You are not "zooming in" or "panning and scanning." You are literally opening the frame to reveal the image the camera saw—more sky, more ground, more visual information on the top and bottom of the screen.
It's not a second Godzilla.
There is also a nostalgic, "broadcast" charm to the Open Matte version. For many who grew up watching the film on VHS or early DVD releases, the full-screen look is how the movie lives in their memory. However, unlike the "Pan and Scan" versions of the 90s—which chopped off the sides of the image to fit a TV—the Open Matte version preserves the width while adding height. It’s the "maximalist" way to view a film that was already designed to be a "more is more" blockbuster. The Visual Flaws Godzilla 1998 Open Matte
While providing more visual information, Open Matte versions can occasionally reveal "sins of production," such as boom mics or the edges of sets that were never meant to be seen by the public. Where to Find It An version occurs when that masking is removed