Corbin 800 series vs. Corbin CL3400 Series

[rustylock]

I'm looking at a rekey and There are 800 series Corbin and CL3400 series Corbin cylindrical sets. The Manufacturer wants to know specifics for providing cylinders (Keymark High security). Is there a difference between the two? The Installation Instructions on both series are the same even the picture of the break down and one of Corbins reps said the only difference should be in the inner workings. So how would this effect the cylinder? Wouldn't both series use the same Corbin 6 pin cylinder casing?

[cledry]

Same cylinder.