what is diffference between conventional core and Primus core

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Schlage offers a comparable cam to the Yale 2160 and it will operate any Yale lock that utilizes the Yale 2160 cam.     Schlage Cams for Yale 2160  Part Number  Description  B520-7...
Primus is only available in 6 pins in a conventional key-in-lever or full size interchangeable core designs.
 DESCRIPTION PART NUMBER   Conventional Core  23-030  Conventional Core less logo  23-031  Primus Core  20-740  Primus XP Core  20-740-XP  Primus Core less logo  20-741 ...
Conventional Cylinders - A conventional cylinder is one that requires some breakdown of the lock in order to be removed. These are the most commonly used cylinders sometimes called key-in-lever...
The ND85/AL85/A85 hotel lock is only available in a conventional Key-in-Lever cylinder.  Interchangeable core and Primus are not available with this function. 
A Primus Hotel cylinder (as well as an IC hotel cylinder) is not possible because there isn't enough room inside the cylinder for all of the required components. 
When ordering dogging with cylinder; specify complete cylinder with appropriate option below:XQ11-949 for all conventional cylinders  XQ11-948 for full size and small format IC cylinders
XQ11-947 was used Classic conventional cylinders prior to the release of modular - NOW OBSOLETE
UL437 is testing requirement that cylinders pass both a timed cylinder pick test and a forceful core/cylinder pull test.  We have various cylinders to meet this need, please reference our price boo...
Part numbers for Schlage and Falcon cylinders for Von Duprin devices are listed below. (KIL = Key In Lock) SCHLAGE   Mortise Rim KIL ...
FALCON   Mortise Rim KIL Conventional 986 x #4 cam 951 A23165-02 Small Format Housing C987...
If unclear whether mortise, rim, or key-in-lever is needed, reference links below to determine what cylinder type is needed.  In order to determine cylinder type needed,  you must first k...
Devices built After 2/28/2011: Use a 1 1/8" - 1 1/4" mortise cylinder with straight narrow cam. (Cam profile same as the Schlage B520-731, see table below for part numbers) Devices built Befo...
 Modular 1-1/8"  Modular 1-1/4"  SFIC and FSIC  Non-Modular Non-IC Conventional  Non-Modular Non-IC Everest Primus  B520-730  B520-731  B520-2...
The 914KIL-IC trim is shipped with a Small format interchangeable core (SFIC) in a 6 pin "A" section/keyway.  A comparable core from Falcon would be the C646 (uncombinated - no pins) or C...
For all Schlage and Falcon small format interchangeable cores shipped from the factory 0-bitted, the control key will be cut to all 4's.