Roofing Felt and Tar Paper are pretty similar materials but the difference between Tar Paper and Roofing Felt is that Tar Paper is made from Tar while Roofing Felt is made from Asphalt.
Asphalt and Tar are different products and Asphalt Is made from crude oil so is an oil based product while Tar is made from broken up stones that is mixed with and made from coal.
They're in a way similar and can be confused with each other but they're different.
Asphalt is an oil based product while Tar Paper is not.