LogFAQs > #909114408

One thing I have to point out is there's an odd continuity between the games.

Any time the tyrannosaurus eats Dr. Grant, his hat floats down. And the Sega and SNES versions both have the electricity gun and darts. That tells me that some of the same people worked on the games or else the studio had a specific vision for how the properties should be handled. I remember the movie had action figures back in the day. I wonder if Dr. Grant's toy had an electricity gun.

The NES game was probably the first one to go into production and they had decided by the time the 16-bit games came out that Dr. Grant should shock or tranquilize the dinosaurs rather than killing them.