This is going to be a difficult question to answer. Every lab has different terms to call the various functions a person can perform. In my time, I've been a Scientist, QA Chemist, QC Chemist I (that company had grades II and III in the same positions,) or simply a QC Chemist. I started as a lab technician, then became a Junior Scientist, and some places I've seen want to consider the work I do now as Chemist Technician work. So it will be hard to get a definitive answer for you.