These questions ask the same thing about features with the same wording that do the same thing.
One of these quotes is copied from Superior Technique, and one is copied from Martial Adept, can you discern which is which?
You gain one superiority die, which is a d6 (this die is added to any superiority dice you have from another source). This die is used to fuel your maneuvers. A superiority die is expended when you use it. You regain your expended superiority dice when you finish a short or long rest.
You gain one superiority die, which is a d6 (this die is added to any superiority dice you have from another source). This die is used to fuel your maneuvers. A superiority die is expended when you use it. You regain your expended superiority dice when you finish a short or long rest.
Superior Technique, Tasha’s Cauldron of Everything:

Martial Adept, Player’s Handbook:

All of the linked questions are asking how the two above quotes interact with the level scaling from the Battle Master’s Combat Superiority feature. But since the above quotes are duplicates, the questions are duplicates - they ask the exact same question about the exact same body of text.
Your question has a non-duplicate inside of it.
Your question, Can the superiority die from ‘Superior Technique’ be used for newly learned combat maneuvers?, contains a non-duplicate inside of it, that is, if you take Superior Technique before taking Battle Master at 3rd level, can you use the Superior Technique die on maneuvers learned from Combat Superiority. This is not a dupe, and if you edit your question to ask about that and not the level scaling, we can reopen it. Some details about why you think it might not be the case would be helpful though, as Medix2 points out:
I will say, "Can the superiority die from superior technique be used to perform the newly learned maneuvers?" is probably a new question, though I'm unsure why one would theorize that it might not be able to be used and it may be good to explain why you think that might be the case or what is confusing about the scenario