Please let me know this scenario regarding if XMR can be tracked ?

If a person A send 2 XMR to an Exchange and a person B also send 2 XMR to the same exchange address, can't they be verified on the XMR blockchain that they send both send how many XMR each to an exchange XMR addreess?

ALso, if a person A send 2 XMR to a person B XMR wallet, can't the third party know to which address the person A is sending his XMR ?