Are 463 and TFCA the same thing?

Yes, 463 and TFCA (tax-free car allowance) are the same.

463 and TFCA both refer to an “accountable allowance.” An accountable allowance is a car allowance designed to be compared to the IRS rate. Rules and regulations set by the IRS must be followed to maintain non-taxable reimbursements.

Cardata uses “TFCA” to describe accountable allowance programs.