Sentinel-2 offset and scale

Hi all,
I am working with Sentinel-2 2A (Surface Reflectance, processed with Sen2core) data. Images from 2016 and 2017 have very different value ranges. For example, 0-255, 0-1.75, 0-16000.
I want to use these images for classification and do comparisons between years, so I need to make sure that the ranges are comparable. Where can I find the meta-data of each image? Is there any information there on the offset and scale used so I can re-scale the data to the same range (let’s say to reflectance 0-1).
Thanks in advance!

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Did you apply the new release sen2cor 2.8?

New release of Sen2Cor 2.8 is available