I don't have any specific information about the "DP-UB824EGK" model compared to the "DP-UB820". However, to compare similar Panasonic models, here are some general points that might be relevant:

- Build quality: Newer or more expensive models may have better build quality or more robust materials.
- AV features: More expensive models may offer advanced features such as better support for HDR formats or improved audio quality.
- Connectivity: Newer models may include more connectivity options, such as additional HDMI ports or improved wireless connectivity.

For precise information, I recommend that you consult Panasonic's official specifications or contact their customer service department.