The 594 has 10bit instead of 8bit colour depth. This is important for HDR

Samsung Electronics GmbH
Hello,
Thank you for your enquiry. The different model names in this case represent the respective different market regulations. The Samsung U32R590CWUXEN monitor is intended for the UK market, whereas the Samsung U32R594CWU is intended for the German market.
Kind regards from Schwalbach,
Your Samsung Service Team