What is the difference between a Kensington vs Noble lock slot?

What is the difference between a Kensington vs Noble lock slot? kensington security lock slot The ClickSafe® Universal Combination Laptop Lock fits any laptop security slot — standard T-bar kensington lock slot use Compatible with Kensington Standard MicroSaver™T-Bar™ locks; Alcohol surface preparation pad included; Ideal for when the Kensington security slot is

kensington slot Compatible with Kensington Standard MicroSaver™T-Bar™ locks; Alcohol surface preparation pad included; Ideal for when the Kensington security slot is