The Beta lists the sentinel basic stats as the same in the core rulebook (ie silhouette, speed, handling, shielding, armor, ht/strain thresholds are all the same).
From the beta:
Hull Type/Class: Shuttle./Sentinel.
Manufacturer: Sienar Fleet Systems with Cygnus Spaceworks.
Hyperdrive: Primary: Class 1, Backup: Class 10.
Navicomputer: Yes.
Sensor Range: Close.
Ship's Complement: One pilot, one co-pilot, three gunners.
Encumbrance Capacity: 500.
Passenger Capacity: 54.
Consumables: One month.
Cost/Rarity: 240,000 credits ®/7.
Customization Hard Points: 0.
Weapons: Forward-mounted retractable medium laser cannon battery (Fire Arc Forward; Damage 6; Critical 3; Range [Close]; Linked 3).
Retractable dorsal twin light ion cannon turret(Fire Arc All; Damage 5; Critical 4; Range [Close]; ion, Linked 1 ).
Retractable ventral heavy repeating blaster turret this weapon's entire profile uses personal scale, not
planetary scale (Fire Arc All; Damage 15; Critical Hit 2; Range [Long]; Auto-Fire, Pierce 2, Vicious 1)
Forward-mounted concussion missile launchers (Fire Arc Forward; Damage 6; Critical 3; Range [short];
Blast 4, Breach 4, Guided 3, Limited Ammo 8, Linked 1, Slow-Firing 1 ).
IMO, I would say they changed the ship around to make it more similar to the Lambda then they suggested in the Beta version. It seems like the Sentinel would be a larger ship with a passenger capacity of 54.So they changed that to 20. They also took off the turret and the concussion missile launchers and gave it a couple hard points. They also made it less expensive, and a little easier to find mechanically. Im not sure about the squad numbers, which range from 3 to 9 on Wookiepedia ...