Discrepancy in battery size and LTE bands for SM-G9860 [Samsung Galaxy S20+ 5G Dual-SIM SM-G9860 - 321900]

I'm looking at the JP version of the website and the tech specs for SM-G9860. 

I see some discrepecies in the information which I want clarified before I make a puchase. 

The battery size is listed both as 4000mAh and 4500mAh

LTE Band 20 is listed in one place and not listed in another

Could you please reconfirm ALL the bands? 

Please refer to this post.