If you're asking if memory cards can be used with more than one console, yes they can.
If you're asking about PSN cards, no.
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yes, they uasally do
Many stores that sell video games also carry PlayStation Network cards
Yes, you can use them to save PlayStation 1 games when you play them on the PlayStation 2.
Bella Sara cards come with codes that be used online for horses and other items for your game. Once the codes have been used, they are no longer valid.
You can get a cheap PlayStation 2 memory card online from Amazon for roughly $13. You can also purchase used PlayStation 2 memory cards from used game stores such as GameStop.