[masraum]

I did a google search, and based on google images, they look damn near the same.

Then I found this.

Grab hook: Designed to “grab” to keep a chain from slipping off the hook.

Slip hook: Generally had a wider throat than grab hooks and sometimes has a latch design to keep an attached object in its place.

So, it doesn't sound like there's much difference.

Can you find or take pics showing what you'd consider to be the major difference?