Replacing an existing color, gradient, or pattern in the Swatches panel globally changes objects in the file containing that swatch color with the new color, gradient, or pattern. The only exception is for a process color that does not have the Global option selected in the Swatch Options dialog box.
When you delete a spot-color or global process-color swatch (or a pattern or gradient containing a spot or global process color), all objects painted with those colors are converted to the non-global process color equivalent.