GBuffer Base Color dosent match Scene Texture : Base Color

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Hello,
I have a problem working with Scene Texture : Base Color (as stored in GBuffer) in a material postprocess.
I am trying to match the Buffer Visualisation : Base Color. But the gap is pretty extreme, seems like the Scene Texture in the postprocess material has too much contrast.
I’ve tried converting from LinearToSRgb / SRgbToLinear /Linear to ACES. My unreal is set as default in SRgb/Rec709. Didn’t find any documentation on what is the colorspace and gamma of those GBuffers pass.
With Buffer Visualisation : Base Color :

image
image1383×516 38.9 KB

image
image1241×548 27.9 KB

With Scene Texture : Base Color (as stored in GBuffer) in a material postprocess, viewport in lit mode :

image
image1364×509 49.5 KB

image
image1270×536 31 KB

Thanks in advance for your time.

Maxime