Does "safety level" mean the same thing as "level of safety"?
I suspect that the former is used as a technical term, with exact definitions of different safety levels. This would be similar to biosafety level, which talks about biocontainment of hazards. In such a scenario, it's describing what (or how much) safety precautions are required.
By contrast, I think that "level of safety" is a vague term, which you would use to describe a "high level of safety", or a "low level of safety", such as in this news article College Prep School Demands High Level Of Safety. And that it means that something is either safe, or unsafe.
onelook.com doesn't have an exact match for "safety level", nor for "level of safety".
Is my suspicion that the phrases have different meanings correct?