FB RSU grant, cash value vs RSU count?!?

Hi. Not sure why I didn't bother to think of this when I accepted, but how does the RSU grant work for employees? When I got my offer, the RSU grant was translated to me in terms of cash value, i.e. $100,000. My previous job, RSU was offered to me in terms of count, i.e. 1,000 RSU's. Is this just semantics? Or does Facebook actually award RSU's in terms of cash value at the time it vests, vs the actual RSU count based on value of when you start? Not sure if that's confusing or not. Assuming FB stock continues to climb, being award the cash value when the stock actually vests would mean I actually stand to lose a lot of value vs. if it were calculated by RSU count. For example, let's say FB tells me as a new hire, that I'm getting $100,000 over 4 years, vesting every quarter. That's $6,250 in cash amount every quarter. Let's assume every quarter, FB stock increases in value. If FB awards based on cash value, that means every RSU count in each vest is actually less and less. i.e. 100 the first quarter, 95 the second quarter, etc. etc. to the point where at the end of 4 years, you'd be getting considerably LESS RSU's than when you first started. At my previous employer, as part of my package they gave me an RSU count, not cash value, so ex. 1,000 RSU's. That's roughly 63 RSU's vested every quarter, regardless of value. If the stock appreciates every quarter, that means the value of that 1,000 RSU's when I first started, is a lot less than after 4 years, which is a better scenario than if it were granted based on cash value.