Chinese pilots call China Southern "China Slowly" because they get paid by the hour. They do fly slow, as I was stuck behind them many times.

2/3's of the hiring process at every Chinese airline is identical. You are passing the requirements for a Chinese ATPL. You take a medical at a CAAC hospital, at take the written on a computer at a CAAC computer facility.

The sim is the only difference, and it varies by airline and maybe even by the day you interview. At some point, you have to pass a CAAC ATPL checkride. It might be your screening sim, or a few months later. At my airline, it depended on whether they could get the sim time for a full check ride, or just a 1 hour "screening".