Clear picure of WS2812B pixel digital strip light:

Clear picture of WS2813 programmable strip light:

WS2812B LED strip is the IC built-in strip light each LED is individually programmable and addressable.

WS2813 LED strip is the IC built-in strip light strip with each pixel individually addressable too,

So what is the difference between with WS2812 and WS213 tape light ?

We made a table for easy comparison, please have a look below:

We can see only the wires are different which means the Internal circuit structure is different. Please see the data transmission in below picture:

For WS2812 IC, if one IC is defective, the signal is not able to pass through

For the WS2813 IC, If one IC is defective, the signal can still pass through, this is an advantage.