Mortise lock key way question

A quick learner from California says:
What is the significance of the degrees in the key way (45 vs 90)? I'm pretty sure which mortise lock style I should order but the key way degree difference is confusing me. I dropped the broken mortise lock down into the patio doorframe while trying to remove it so I don't have the original lock for a reference.
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Tom from SWISCO responded:
The degree of the key way basically just shows how far it turns to engage the lock. In the 82-218's case, the keyway has to turn 45 degrees before the lock is fully engaged.

I can't really say what you need. You will have to try to get your old mortise lock and check it.
A professional from California says:
The 45 degree cartridge is more common.
Look at the post from the back while you turn the lever.
Most handles will turn from 45 degrees up to 45 degrees down.
Some will spin all the way around.
82-255 is the only handle I can think of that might use the 90 degree lock, and it could also use the 45.
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