Image looks after resampling less reddish. color redshift?

[marpet]

If you created also a subset the histogram changes. And this influences the RGB image creation.
I already wrote about it here:

Colour anomalies in Sentinel 2A products

Yes, it is very likely that the different display is cause by a different distribution of bright and dark pixels in the histogram. Unfortunately, the images are scene specific and can not easily be compared. Good constant value ranges for the RGB images are Red: 0 - 0.35 Green: 0 - 0.30 Blue: 0 - 0.25 If you want to do this automatically you could follow the description I gave recently:

I’ve attached a ready to use RGB profile which you can load in SNAP. With this one you should get constant values.
s2Profile_B432.rgb (163 Bytes)