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This however, does NOT sound like any FF, except for MQ, the Dentetsu Series (legends), not that I ever played them, so I would not know. The picture also does not look like any map from the numbered FFs. By a stretch, it looks like one of the Chronicles (FFIV and Chrono Trigger), also released on PSX, and comes on a 2 disc set. Tactics could look like this, but it does not come on 2 discs.
FFIV does not have the grass in the castle, or random encounters at the beginning, but it does have the Town/Castle set up like in FFI and FFIIj. I don't really recall FFV having a castle like that either.
So, it could either be FFI, IIj, IV (tentative), or Chrono Trigger. There's another filter for you from seven, but I added one more. There's also the possibility it wasn't a FF at all.
Tactics has no "night and day", in the gameplay. You can physically walk anywhere in tactics, like you do in other games. Have you played FFT? (By the way, if you haven't, you need to.