You can copy or move appearance attributes by dragging or by using the Eyedropper tool.
Drag the thumbnail at the top of the Appearance panel onto an object in the document window. If a thumbnail isn’t showing, choose Show Thumbnail from the panel menu.
Alt‑drag (Windows) or Option‑drag (Mac OS) the target icon in the Layers panel onto the item to which you want to copy appearance attributes.
To move appearance attributes instead of copying them, drag the target icon in the Layers panel from any item that has the desired attributes onto the item to which you want to apply it.
You can use the Eyedropper tool to copy appearance attributes from one object to another, including character, paragraph, fill, and stroke attributes between type objects. By default, the Eyedropper tool affects all attributes of a selection. To customize the attributes affected by this tool, use the Eyedropper dialog box.
Click the Eyedropper tool to sample all appearance attributes and apply them to the selected object.
Shift‑click to sample only the color from a portion of a gradient, pattern, mesh object, or placed image and apply the color to the selected fill or stroke.
Hold down the Shift key and then the Alt (Windows) or Option (Mac OS) key while clicking to add the appearance attributes of an object to the selected object’s appearance attributes. Alternatively, click first, and then hold down Shift and then Alt or Option.