The Photoshop Raw format is a flexible file format for transferring images between applications and computer platforms. (this is an ancient file format for compatibility with legacy OSes and digital imaging applications)
A Photoshop Raw image is not in the same file format as a camera raw image file from a digital camera. A camera raw image file is in a camera-specific proprietary format that is essentially a “digital negative,” with no filtering, white balance adjustments, or other in-camera processing.
As such, you should only use this format for specific legacy needs and not for compatibility with Adobe Camera Raw.