Ask you two questions: as shown in figure: running OSPF routing protocol between R1 and R2, PC1 PC2/PC3/PC4 segment does not repeat, configured PC1/PC2/PC3/PC4 can be Shared,

Question 1: if the PC1 and PC3 private segments overlap, such as all become 192.168.1.0/24 segment, what will happen?
Question 2: if R1 g0/0/0 and 0/0 R2 g0/do NAT, R1 and R2 is public IP directly, PC1 and PC2 does not directly PING PC4 PC3 or private IP? PingR2 G0/only 0/0 of the public IP? If this time PC1 and PC3 or PC4 segments overlap, such as PC1 and PC3 segments are become 192.168.1.0/24 segment, what happens?