1. Station vs. MSL Pressure
Excerpt from:
Aviation 120: Meteorology
Selkirk College

2. Station Pressure vs. Sea Level Pressure
The pressure at a particular location after barometer errors are corrected
This pressure is NOT corrected for the elevation above sea level of the station
This pressure is not very useful due to the difficulty comparing it to other places which may not be at the same altitude
Sea Level Pressure
Sea level pressure is the station pressure adjusted to an altitude of zero which is mean sea level
The correction for altitude is about 10 hPa per 100 m but is not constant, it varies with temperature and density
Since sea level pressure of a station is adjusted to an altitude of zero, this is the pressure used to compare atmospheric pressures between different locations
The sea level pressure is the pressure depicted on surface weather maps with isobars
Altimeter settings are MSL pressure corrected using the standard atmosphere.

3. Station Pressure vs. Sea Level Pressure