SO Pump on HO truck? Why Not?

I would ask Bluechip. There may be a difference in keys (timing) HO to SO?
 
Just swapped an SO on to an HO truck. More power, cooler egt's, better running all around. This was going from a bad HO pump to a good SO pump.
 
Mine picked up with the SO but I had 100hp injectors instead of the restrictive stockers.
 
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