For a superslim ?, you can check in this table, but there are not much reports of superslim, it seems the KES-850A (laser pickup) could work, but im not sure
https://www.psdevwiki.com/ps3/Bluray_Drive#Bluray_Drive_Revisions
The best you can do is to take a look at your actual laser, it have an sticker with the model, sadly it seems in KES-850A the sticker is covered by some metal, is this photo, the sticker with the QR code... the name should be at his left in that same sticker
Well, based on your previous comments, and in general... there is always a point in his lifespan where the laser is at his limit, usually because the diodes have weakened (so the laser beam have less power), etc...
At that point is when appears random errors, e.g. a game that loads fine today but tomorrow doesnt loads... or it loads only if you place the console in vertical (yeah, this myth is true, the laser reads better when the console is in vertical position)
Those are the kind of signals that the laser is having problems... after the lens cleanup (to confirm that it was nto caused by dust) we can only conclude that the problem is going to increase exponentially in the next days/weeks. In othr words, the laser is agonizing and is going to die soon
In some way you are are lucky to have that synthomns, sometimes it happens that the laser dies instantly (without any previous advise), you know... now it works perfect and 1 hour later doesnt works at all (completly blind), when this happens there is no confirmation of the problem, the only thing you can do is to buy a new laser and pray
But as said... in this case if i had to bet (based in the few info i got) i would say you have a high probablitity of fixing it by replacing the laser
My suggestion is to wait a few more days before ordering the laser... your goal now is to stress it and kill it. If you kill it is going to be the definitive confirmation that it was about to die
You only need to play some games with it, the most you play the most frequent will appear the reading errors, u to the point where is not going to be able to read anything