AWS Cost Explorer discrepancy for Root and linked account

I'm pretty new to the cost explorer and looking at this scenario: There's a root(organization) account which has multiple linked accounts like this:

Root Account
 - Account B
 - Account C
 - ... 

When I filter a specific Account (AccountB) from the Root account, I see a cost discrepancy comparing to the view from AccountB itself.

here's the image to demonstrate the issue better :

• Root account view, filtered by Linked AccountB:

• View from AccountB itself:

Any idea/suggestions why I see this discrepancy ? (anything else I need to do to get the same cost for AccountB and root->AccountB ?)

So Saving plans are actually shown in both views, but EDP and Private Rate card discounts are only shown on the root account.