Usually you can take that kind of info from support with a grain of salt. The TVs are identical other than a different stand/color. Other variants in different regions such as 93A/92A/91A are all rated as Quantum HDR 1500 in 50 inch. Only the QN94A (UK) isn't which most likely is a copy-paste mistake (wouldn't be their first). The larger QN94A is actually different to the (EU) QN90A, but in your case there is no (hardware) difference. As mentioned above 'D' indicates Innolux. They use 50 inch AUO panels in the Q80A and Frame but those are only 60Hz and without mini-LEDs. The QN90A will be the best you can get LCD wise in 50 inch. If you favor no blooming you should go for OLED, but you will lose exceptional brightness.According to Samsung support, the smaller version of the QN94A is identical other than being 500 nits brighter so i didn't bother spending the extra £100. Hopefully i haven't made the wrong choice if it turns out that the 94a is superior elsewhere and some part of me does regret not going for the OLED.
Please tell me if i reading in the wrong place but the panel information next to option in the service menu reads 50D1AU9TA. Does this mean it's made by au optronics? I thought InnoLux made the panels for this size? I'm pretty sure it's a VA due to the colour shift off angles.