What's the difference between these two products?

[Naanika]

I'm not very knowledgeable when it comes to this stuff, can somebody please explain what the difference between these two are?

https://au.pcpartpicker.com/product/YC8H99/corsair-vengeance-led-64gb-4-x-16gb-ddr4-3200-memory-cmu64gx4m4c3200c16b

https://au.pcpartpicker.com/product/jXkwrH/corsair-vengeance-led-64gb-4-x-16gb-ddr4-3200-memory-cmu64gx4m4c3200c16

One is significantly cheaper with a particular retailer compared to the other and I don't understand why.

 

[Rexper]

One's white LEDs, the other is blue. Price difference is probably due to stock deficiency.

The product numbers are exactly the same except for the blue led variant having a 'b' on the end, most likely standing for 'blue'.