[Sammy Sandbag]

Yes, those are spider gears, not pinions, which there is only one of in a differential. Technically they are called pinion gears, but I've only heard of them refered to as spider gears. The input pinion is the one most of us are familiar with (ie Ring and Pinion.) And if you are talking about spider gears, there are usually 4, 2 would not work. But those four spider gears could be labled side gears and pinion gears, in which case you'd have 2 of each.