The 412J is the same as the 412 functionally, but internally it is *very* different.
This cabinet, which was made in Japan, has NO parts that are interchangeable with a 412 (which was US made).
Leslie Model 412J
Basic Specifications
Amplifier Type
Solid State
Output Power
Drum
Rotosonic
Horn
1 – Compression Driver
Speeds
3 Speed (Chorale/Stop/Tremolo)
Interface
11 Pin