Here is the difference;
1. Can you please confirm if you receive my PCC from so and so country? OR Can you please tell me how to obtain a document? OR Can you extend my deadline?
(For the above, you may not get any reply, these are all procedural or confirmation question, they will not confirm anything over the email even if they grant you more time OR explain you any of the proceudres.)
2. Can you please update the status on my application, I applied on such and such date and want to confirm which phase my application is at?
(For something like this, you will get a reply in the order the question was received)
Again these are my opinions, I am not sure how they tackle these kind of emails in reality.
1. Can you please confirm if you receive my PCC from so and so country? OR Can you please tell me how to obtain a document? OR Can you extend my deadline?
(For the above, you may not get any reply, these are all procedural or confirmation question, they will not confirm anything over the email even if they grant you more time OR explain you any of the proceudres.)
2. Can you please update the status on my application, I applied on such and such date and want to confirm which phase my application is at?
(For something like this, you will get a reply in the order the question was received)
Again these are my opinions, I am not sure how they tackle these kind of emails in reality.