Answer
These are two distinct, separately-introduced features rather than the same thing under two names: Freight Integration is an older North-America-focused capability built around a specific third-party freight partner integration requiring its own separate commercial agreement, while Freight Booking is a newer, partner-agnostic feature aiming at similar freight-booking functionality without being tied to one specific 3PL provider, with incremental capability added to it across releases — if you're expecting one to behave like the other, confirm which of the two features you actually have licensed/enabled first.