The change to the display color happened a while ago, it’s been discussed here before. No change to features or model numbers IIRC.
I received one of the updated units in April and have reported the changes here:
https://www.eevblog.com/forum/testgear/korad-ka3005p-power-supply-ui-changes/msg3547524/#msg3547524Besides the cosmetic changes, the LOCK LED and the "persistent adjustment mode" both seem to be new, and are impovements to the UI in my opinion. Annoyingly they did not change the way the memory function works: Any changes you make to the voltage and current settings will immediately change the preset which is currently active.
Edit: Hmm, so Welectron have now used this opportunity to increase the price... When I ordered and (eventually) received mine, they had not listed this as a new model. So I received my green/red version as a nice surprise, and for €99.