No. In GTA Liberty City Stories, the developers didn't incorporate the ability to swim. This means that any body of water in the game is more of an obstacle than something you can traverse through. If your character falls into the water, you'll see them struggle briefly before drowning. It's just one of the features that distinguish this installment from others in the GTA series where swimming is often available.
Yes, you can swim in GTA Liberty City Stories. Swimming can be a useful way to escape pursuers or reach areas that are otherwise difficult to access by land. However, your character's swimming ability is not unlimited, and you need to be careful not to drown if you're in the water for too long or if you're in rough waters.
In GTA Vice City Stories, swimming is a feature that is available. So, if your character is near water, you can jump in and swim around. This adds to the exploration aspect of the game as there are various areas in the game world that are accessible via waterways.
In GTA Vice City Stories, swimming is not an option. The developers didn't incorporate that feature into the game. Maybe it was to keep the gameplay focused on other aspects.
Definitely not. GTA Liberty City Stories is a separate installment from GTA 4. They have distinct settings, missions, and graphics. GTA 4 has more advanced graphics and a different narrative focus.