Result

Windows

Mac OS

Create new swatch based on the current swatch

Alt-click New Swatch button

Option-click New Swatch button

Create spot color swatch based on the current swatch

Alt+Ctrl-click New Swatch button

Option+Command-click New Swatch button

Change options without applying swatch

Shift+Alt+Ctrl-double-click swatch

Shift+Option+Command-double-click swatch