The data stored is always the same. The point is that for Chip & PIN cards, the banks don't expect any magstripe transactions at all (for markets where EMV is

The data stored is always the same. The point is that for Chip & PIN cards, the banks don't expect any magstripe transactions at all (for markets where EMV is in effect, like the UK), which means the card data would be pretty useless as anyone attempting to use them would trip all kinds of fraud alerts. I would not worry about the card data. What's much more important is the other stuff like loyalty cards, etc.