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Comparison between old NXTLineLeader and new Light Sensor Array
The Names printed on the sensors
Printed on old sensor: NXTLineLeader
Printed on new sensor: LightSensorArray

The physical form factor
The old one had sharp corners, whereas new one has rounded corners.
There were 6 mounting holes on old sensor, whereas there are 4 holes on new one.

Internal design
Internally their processors and firmwares are different, the NXT-G blocks and NXC/RobotC API's are also different. (Note, they don't work with each other).

The old sensor internally performed the line following computations, and provided simpler output to follow a line.
The new sensor only provides 8 numeric readings for 8 sensors. It does not perform any computations internally. It is somewhat faster than the old one in reporting readings. You have to write your own line following algorithm.

RoboCup Acceptance
The old sensor was not acceptable in some RCJ competitions because it was too easy to use due to it's internal PID algorithm.

The new LightSensorArray is acceptable in RCJ competitions. (Note, it does not have PID algorithm, if you need to follow line, you will have to write your own line following algorithm).