When there are many issues with a question, it should be closed regardless of how similar questions were treated. Linking the similar questions may help the OP, but the issues remaining in the question still matter.
This question and the previous question about the OS upgrade suffer from not just one issue, but many. As there are many issues with this question, all of them should be resolved before the question is reopened even if the close reason isn't the best for the current state of the question. Fixing the question should always come first.
Just because a similar question works it does not mean that the question works especially when it comes to what specifically what the question is asking. We do need general judgment from our users if a question is clear, too broad, or primarily opinion based as an on topic question can always suffer from these.
This case specifically, while the question may be a duplicate other issues plague it.
Is it a duplicate?
With the given two sentences in the OP's question it's up in the air. The question is certainty similar to the linked, but in the question's current state only the OP can say if it is or not.
These are together as there really is no detail in the question. If you take the question in the title "What are the dimensions of piano keys, in inches?" there's a lot to be desired. There are many different types of pianos and depending on if the OP is including electric pianos or keyboards there is a potential for a whole lot more. Even just talking about the dimensions of the keys on one piano, we aren't exactly sure what the OP means. The OP could just want the length or width or also the height or maybe they want to know about the inner potions of the key also. This is a lot of variables to play with and everyone answering could have a completely different interpretation of it.
It should be noted that the linked question is much more specific, but still the leading answer points to it being a broad topic.
Regardless of the current open/close status, the question is very low quality and as is not very useful to others as is right now due to the unclear reason above. It's not a reason to be closed alone, but it needs to be brought up when examining a question like this and when comparing it to other questions. Our tooltip to downvoting questions very much fits this question:
This question does not show any research effort; it is unclear or not useful
Whether you agree with that stance or not there's a reason that text is there. The OP and others will get as much out of the question as they put in and as of now there isn't much.
While previous research is not required, it helps fill in the gaps of what you already know and what you want to know. A quick search of of "piano key dimensions" brings a resource that may answer the OPs question it may not. Including it in the question and either asking for more detail, for something similar but not the same, or if it was accurate would be much clearer to everyone and more useful to people who find that question. This is not saying the question can't be good quality, but things like this help a lot to improve the question quality.
The question is salvageable, but it needs to be be edited by the OP
Even if it is a duplicate, we'll need the OP to confirm and then we can clean it up for him and mark it as such. If the OP is asking a different question then we need to know. If the OP never comes back, then we're only guessing what they want and we should not try to change the question to something that we don't know. Someone can ask a new question with a similar premise and should be well received as long as it is clear and a little research never hurt.