GX620: difference between HH807 and F8098 motherboards??

Hello!

What's the difference between the GX620 mini-tower motherboards HH807 and F8098?  I picked up a GX620 minitower case with no motherboard, and I'm trying to figure out which one of these motherboards to get.  I've seen both part numbers listed as GX620 motherboards.

Thanks!