Good day. I worked in china for two years and had a Z visa, foreign expert. 2013-2015.

I have been offered another job beginning in August. Can I go in with a tourist L type and then change to a Z type?

My wife has a 10 year tourist L type. She has also been offered a position. Can she come in s a tourist and then change to z type?

Thank you for your help.
roberto Santos