Question

[Niwashi]

You can play on the same account on your ps3 or PC.

You can play on both provided that you've bought both, but the PC copy has to be registered through the Mog Station, whereas the PS3 copy has to be registered through the PSN, so some confusion on whether the subscription cards work the same makes sense.

But yes, even though registering the initial purchase is different according to which platform you use, subscriptions are handled the same for both. They're all handled through the Mog Station, and the cards should work the same regardless of platform.