If a replacement non-Lexus Original Equipment (OE) screen is manufactured to exactly the same standards as a Lexus OE screen then clearly it will be ok.
Unfortunately, many replacement non-OE screens are not, even when manufactured by the same company, eg Pilkington. They are only the same if manufactured to the same standards and there is quite a difference between manufacturer standards and other basic automotive and country/region specific glass standards. Most replacement ‘pattern’ screens are not manufactured to the same standards.
A good friend of mine worked for Pilkington and he confirmed that screens manufactured for the replacement market are not manufactured to the same standards as the manufacturers mandate for genuine OE screens. This doesn’t mean they are no good and clearly some screens will be better than others, depending upon what standards a screen has been manufactured to. My friend told me of quite a few examples of cheaper pattern screens being inferior in terms of whether for example a view is slightly distorted when looking through the glass. This is especially important with regard to forward looking cameras etc that most modern cars have nowadays.
I’m changing my insurer at next renewal time because they won’t allow a genuine Lexus screen to be fitted and if I was to mandate one myself they will only pay a relatively small sum to go towards the replacement. I want to be able to mandate a genuine Lexus screen so it’ll now be something I will always check when taking out new insurance.
For me, a screen is part of the structure of the car and I want it to be a genuine OE screen. Then again, I only use genuine parts for repairs and replacements too so this is just me. A personal choice I think.