The Samsung C32G74TQSU was produced for the German market while the Samsung LC32G75TQSRXEN
lol, sachlich falsch, Samsung Support?????
the difference is the power consumption.
2020 U in the code model almost doubles as much power.
2021 R in the code model consumes significantly less power, but is otherwise identical.
With the 2020 models, there is also the fact that you may have to make a firmware update.
In my 2021 (R) everything is fine and up to date.

The different designations are due to the fact that they are available in different countries. Countries with other product codes are delivered.
Everything is the same.
Just 2020(U), 2021(R)

Translated with https://www.deepl.com/Translator (free version)

Samsung Electronics GmbH
Hello,
we are more than happy to help.
The two Samsung monitors were manufactured for different markets.
The Samsung C32G74TQSU was produced for the German market while the Samsung LC32G75TQSRXEN was produced for the Swiss market.
Kind regards,
Your Samsung Service Team

LC32G75TQSRXEN Is wqhd and 74 is qled