Difference in color after importing

Hello, i made some objects in blender and when i am importing them , i can see a difference in color even though both models are made based on some planes, and nothing else added to make a difference.
What can be the problem? Both models are set to rgb 255 255 255 , Thank you

is hard to tell for me. I think maybe the type of material is different or or maybe is the roghtness , metalness, spectacularity, maybe one of them has a sphere texture or a map

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It was metalness, i guess it matters into what you merge the meshes in blender, my obj was made of cilinder and plane, in some cases i was merging it into the cylinder, some of them into the plane