TLV9002： TLV9002 Open-loop output impedance is too large

However, on the new TLV9062 TINA model there is a test of open loop output impedance. When these models are updated, it might be prudent to update the datasheets where needed - I would have expected the data sheet to change to a 1MHz spec of 100ohm. 

Why is the gap so wide? What's the impact?

They are a factor of 10X different in speed, why are you comparing these two. Cannot answer impact question without intended app. ckt. 

Keep in mind the closed loop output impedance is the open loop output impedance divided by 1 + Loop gain across frequency. If the Loop Gain is high in your intended frequency range, the close loop output impedance will be low even with that 1200 Zol.