Can I alternate Avent Natural and Classic+ bottles and nipples?

The Classic+ bottle is compatible with the Natural nipple when used together with the Natural screw ring. The Natural nipple can be bought separately; the Natural screw ring comes with the Natural bottles. The Natural bottle is compatible with the Classic+ nipple when used together with the Classic+ screw ring. The Classic+ nipple can be bought separately; the Classic+ screw ring comes with the Classic or Classic+ bottles.

The Classic+ nipple cannot be used with the Natural screw ring. The Natural and Classic nipple cannot be used with the Classic+ screw ring.