Do I need hood pins or a latch reinforcement with this hinge?

The hinge itself doesn't require pins — that's determined by your latch and how much hood movement you're comfortable with. Hood pins are a separate decision based on your use case, not the hinge.

Will this work if my driver-side hinge is still good?

Yes. Hinges can wear unevenly. If only the passenger side is sagging or creaking, replacing just that side will fix the problem. You don't have to replace both.

How heavy is this compared to the OEM hinge?

Weight specification not provided — test-fit before committing. If you're concerned about hood balance, order the driver-side hinge at the same time so both sides match.