Yes, it can work, but it’s not always trouble-free. Different devices may create their own folders and metadata files, and some cameras only browse folders they created themselves. Others may show all files under DCIM, including images from other devices, sometimes as unsupported files, which makes playback awkward.

The safest practice is to format the card in the device you plan to use before its first use there. That ensures the filesystem and folder structure match what that device expects and reduces the chance of compatibility issues or odd indexing behavior. It also helps avoid confusion about what’s already on the card and running out of space unexpectedly.

So the main downsides of sharing one card are:

• some devices may not recognize “foreign” folders or files
• playback/browsing can be cluttered by unsupported images
• device-specific index/sidecar files may be created
• increased risk of user error if old files remain on the card

If you do reuse a card across devices, back up the files first and reformat in the device before important shooting.