Indentured servants are foreign people who comes to America, and is put under a contract to go to work. For a period of time, they are just a worker. After the contract is over, the indentured servant could go away. But a chattel slavery is person who are consider a person or their owner's property.
These pictures are showing indentured servants working and the contract for indentured servants.
These are the pictures showing chattel slavery and the documents.