Older 40-039 has slightly different key from newer

A quick learner from Minnesota says:
July 15, 2016
Bought 4 in 2013

Bought 4 more in 2015.

Bought 100 key blanks (on referral from you folks) from Ideal Lock in 2015, planning to cut future replacement keys as need,

Been testing this for use in large Resort property, potentially couple hundred doors. Keys occasionally get lost ...in effect losing "master" for one or more locks.

Maintenance guys (who cut hundreds of keys every year) tell me that the tumblers seem to be ALMOST but not PRECISELY identical from 40-039 to 40-039. (Different keys work with varying amounts of extreme fiddling, etc.) Maybe my 2013 order was different from the 2015 order?
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Dave Sr. from SWISCO responded:
July 19, 2016
I actually just had a key made for my 40-058 handle (which uses the 40-039 dead bolt). I took it to a local hardware store and the name on the key is "High Class Lock" #255. The hardware store said they brought in the keys specially for storm door locks. Hopefully this information helps.
Keyed Deadbolt
Keyed Deadbolt
40-039
$23.70
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