Red,
Pork rinds usually are just fried skin, and are usually kinda fluffy and crispy, ideally melt in your mouth. 4505 classic chicharrones are the best packaged pork rind around.
Pork cracklings are sometimes the same as pork rinds, but often have some fat attached and are a little denser and harder than pork rinds. Epic maple bacon pork cracklings are the best packaged ones I’ve had (tho I haven’t had many).
Chicharrones can be either of those things, (skin or skin+fat), or can also be skin+fat+meat. My favorites are fresh out of the fryer at La Palma in San Francisco.
In this last pic, the lighter ones at the bottom look like classic pork rinds, while the sorta chunkier pieces near the top of the pic look more like cracklings.