Biden's lawyers are covered by lawyer-client confidentiality, FBI agents are not.
But are the lawyers protected from criminal liability for handling top secret information? TFBI agents may be, depending on their clearances. But they lawyers went out there, intentionally seeking classified documents for which they had no right to possess.
That's true but remember what the never-trumpers did to DJT's A/C privilege with Cohen and various other counsel with the J6 unselect committee. That's precedent to fight any treatment that differs between the DJT and FJB. Lawyers are fair game now in DC. Dims gutted the privilege, now they have to live with it.