Hello, is there anyone that can help me on this question? I would like to find out what type of processing center is the Guangzhou consulate in China.

What is the main different between those two? I kinda knew it's something regarding the Form DS-230 (Part I or Part I & II), how about supporting documents? Any differences on those?

Thank you for your help, and sorry for all the questions.

Guangzhou is standard.
here is stuff send back NVC
ds230 part1 (sign)
2 photos
copy of benificary pasport data page
ems label for p4 for p4 packet (optional)

stuff send in during interview
but during medical exam doctor will help you put them together and seal the packet untill interview

1 police cert
2. marriage cert
3. divorce cert
4. medical exam
5. ds230 part2
6. bond fide marriage evident
7. 2-4 photos
8. birth cert

Thank you so much for the answers.
I'm applying for my mother, so I am assuming it's quite similar to the CR1 cases, right?

it should be similar. that documents need is rather marriage cert you have to show your mother and your self relationship