What is the difference between we mailed you a notice that we have approved this I485 APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS. and Card mailed message?
And that's the whole point, what else would you want to know?
But seriously, they literally mean what they say. The "notice" one is they mailed the form I-797 (approval notice) and the "card" one is they mailed a physical card. Whether or not the actual sequence of event matches the order of emails is totally another thing, though.
wish they meant what they meant to say. My curiosity what how long does it take to go from notice mailed to card mailed.