Difference between NDVI in playgound app and OExplorer

Good day,
I’am new here, so please exuse me for my stupid question.
Why is Vegetation index (in Playground app) diferent from NDVI (in EO explorer) in apps of Sentinel Hub, even if it’s the same combination of bands?
Is there any diference in visualization? Or its just that gray is red?
Image of the same territory in both applications in attachement.

They are both NDVI with slightly different visualizations. Please check this answer, which answers to the same question in detail.

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Super! thank You very Much