A curved boom offers better reach and visibility.
As for the difference between the 2365 vs 2465, it's the following.
MODEL KB2365
Digging Depth 76.4"
Reach (From center of Swing Pivot) 105.5"
Loading Height (Bucket at 60¡Æ) 63.6"
Swing Arc 180¡Æ
Transport Height (Maximum) 73.1"
Transport Overhang 43.5"
Bucket Rotation 180¡Æ
Stablilizer Spread (Down Position) 76.8"
Stabilizer Spread (Up Position) 49.2"
Shipping Weight (Less Bucket) 785 lb
Bucket Digging Force 2,875 lb
Dipperstick Digging Force 1,744 lb
Operating Pressure 2,000 psi
MODEL KB2465
Digging Depth 76.3"
Reach (From center of Swing Pivot) 113.1"
Loading Height (Bucket at 60¡Æ) 63.6"
Swing Arc 180¡Æ
Transport Height (Maximum) 77.2"
Transport Overhang 43.5"
Bucket Rotation 180¡Æ
Stablilizer Spread (Down Position) 68.7"
Stabilizer Spread (Up Position) 46.4"
Shipping Weight (Less Bucket) 1,036 lbs
Bucket Digging Force 2,817.5 lbs
Dipperstick Digging Force 1,748 lbs
Operating Pressure 2,466 psi