Do I need a hood pin or catch once I install this hinge?

That depends on what you're running. If your hood currently latches at the front with a factory catch, keep that setup. Hood pins are typically only needed if you're running an aftermarket latch or running without a front catch for clearance.

Will this work with my OEM hood latch?

Yes. Since this hinge matches factory specifications, it integrates with your existing front hood latch. The latch and hinges work as a pair—if your latch is good, the hinge will too.

Is this heavier or lighter than the original?

Built to OEM weight specs, so you're looking at the same heft as the factory hinge. Weight is not a gain or loss here.