The AC transformer and the DC charging parts or the same. The cradle that you clamp the strion in is different (to fit the strion). The cradle is all you need.
The transformer might be the same though. It just supplies 12ish volts to the actual charger. It's the same DC (car) charging cord, so I would assume that the AC transformer is probably the same or similar. The output current might be different even if the voltage is the same.
The AC transformers that came with my stinger, ultra-stinger and strion are identical. I presume that the 12 volt DC is identical also, and has worked flawlessly now for several months.