Short answer: yes.
Longer answer: yes, easily, in the same account, with the same custodian, in the same vault, and nobody will even blink.
The question gets asked constantly, which tells you something. People assume there is a rule stopping them. There is not.
What there is instead is a set of consequences that nobody mentions until after the wire clears. Silver behaves differently from gold in a retirement account, and not in the ways people expect.
It is heavier. Much heavier, per dollar. That single physical fact reshapes your storage bill, your distribution planning, and how much of your return the account infrastructure quietly absorbs.
So let us answer the question properly. Not "can you," but "what happens when you do."