We use dual screen setups with identical monitors. For image comparison, it often made sense to run Bridge on each monitor and to maximize the viewport with the spacebar.

Unfortunately, due to the way Bridge is set up, you only currently allow one maximized window, pressing the spacebar on the second window does nothing.

A better implementation would even allow for linked zoom levels and viewport-positions for all instances.

A comparable feature is available inside Photoshop: Window/Arrange/New Window Match All. This Photoshop feature is limited to just one image – in Bridge one should target different images to spot deviating details.