1. Could you please help me distinguish the following?

They seem to have the same function. What is the difference?

2. Regarding Bohr's Law, could you confirm if my logic is correct in understanding how the Hb graph moves toward the right in acidic conditions? Is it wrong to think in terms of Km? Since high Km is equivalent to Low affinity of E-S, I think it makes sense the graph moves to right as high CO2 or H+ decrease the Hb's affinity toward O2 (increase Km).

Thank you so much for your help in advance! =)