cclarry
SFZ - is soundfont format, used by many players

 
Not exactly.
 
SF2 is Soundfont, created by EMU/Creative Labs.  It is a binary, monolithic file format, and can contain many presets.
 
SFZ is a format created by rgcAudio, used in most Cakewalk synthesizers and many others.  It consists of a text file and one or more audio files, and contains a single preset.
 
Here's a nice overview of the difference:
https://sig-ex.com/2016/02/13/sfz-files/