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As you mentioned the D400 series does not have a minimum CPU requirement. The only requirement is a USB 3.0 fully powered port. The Lattepanda does have this hardware requirement so it should work properly. If you have a power consumption problem with the USB 3.0 port you can also add an externally powered USB 3.0 hub.
Aside there might be some applications that would require a minimum CPU or GPU specification for it to run. However for basic usage the Lattepanda should work properly and run the camera.
Feel free to test it and share your comments with our community. reviews about certain products are highly appreciated.
Hope this information helps you.