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Use of Spanning-tree extend system-id for vlan verification

I understand that the system-id extension is used to create a unique BID per vlan in PVST+. My question is 

1) Does the receiving switch will use that "System-id extension" field to verify the vlan that the frame is received?

2) What if there is a native vlan mismatch between the switches( One side is Vlan 100 and the other side is vlan 200). Does the switch use that system-id extension to figure out the issue?