The Truth About Setting Spray and Fixing Spray Revealed

What is the difference between a setting spray and a fixing spray?
Here are my favourite sprays:
MAC Cosmetics
Prep + Prime Fix+ rstyle.me/+MfSu-uqmrRd_4o5veB...
Charlotte Tilbury
Airbrush Flawless Setting Spray rstyle.me/+YoaIXA9YMfSp8lvSZK...
ONE/SIZE by Patrick Starrr
On 'Til Dawn Mattifying Waterproof Setting Spray rstyle.me/+TNSipfFEI7Q3vCJH4Q...
Urban Decay
All Nighter Waterproof Makeup Setting Spray rstyle.me/+UZhEjFNM3w7m0JUmY4...