One fundamental difference between a process chart and a process map is that

a$.$ the process chart uses a time dimension, while a process map is not time$-$oriented

b$.$ the process chart includes the supply chain, while the process map stays within an organization

c$.$ the process chart is more like a table, while the process map is more like a schematic diagram

d$.$ the process chart focuses on the customer and on the provider's interaction with the customer, while the process map does not deal directly with the customer