Yes, both.
Then you must send in the apportioned plate and your old cab card within 30 days after you receive your new apportioned plates. Failure to return your license plates can result in suspension of your IRB account. The IRB will issue new apportioned plates that have a different number, along with a new matching cab card.
Great. And what if both of these plates get lost before I can send them back?
In that case you'll need to get the form Report of Lost or Stolen Motor Vehicle Items (MV-78B) from a police agency.