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MAC address is the physical address. IP address is the logical address.

Now, logical address should be unque in the World. Whereas, physical address should be unique in a network. That is, no two public host should have the same logical address.

But, MAC is unique for each and every device in this world. Also, IP for public host is also unquie in the entire World. Therefore both MAC and IP are globally unique.

Hence, conceptualy, MAC can be used as logical address. But we don't do that, becaue the information in the MAC address is not helpful to route the packet. Wheras IP has helpful information like Network ID and Host ID.

Similarly, Logical Address can be used as physical address as well. But it is not done in all the networks. Like, not in ethernet.

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