for this part number: WS2812B-2020 from the non-cat manufacturer: WORLDSEMI,
we are selling these two direct alternatives from CreeLED, Inc.’s XLamp® XM-L® Gen 2
series in the same SMD 2020 package (5050 metric):
XMLDCL-00-R250-00C5AAA02 as XLAMP XMLDCL HD LIGHT EMITTING Diode
or
XMLDCL-H0-R250-00A4AAA02 as XLAMP XMLDCL HI LIGHT EMITTING Diode
Please review the datasheets to ensure the offered cross will work for your application.