Components
“LED-SMD_4P-L1.6-W1.5_XL-1615RGBC-WS2812B”, by meaning
A component is a schematic symbol with, where the catalog has them, its footprint and 3D package model — linked by KiCad's own references and cross-checked pin by pin.
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Matching “LED-SMD_4P-L1.6-W1.5_XL-1615RGBC-WS2812B” on what it describes rather than on names. This takes a few seconds.