Does the material component of Booming blade need to be the same one used in the attack?

Question

Does the spell specify that the material component need be the same as the one used in the attack?

As part of recent errata to the green-flame blade and booming blade cantrips, their material components have been amended to "a melee weapon worth at least 1 sp" (Sword Coast Adventurer's Guide, 142).

If the attacking weapon and material component do not have to be the same, then can you use a separate weapon (for instance a Pact weapon or a Psychic Blade) for the component?

Answer 1

The material component weapon must be used to make the attack

The spell states (emphasis mine):

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. [...]

The only weapon used in the spell's casting is the material component; no other weapons is required in order to cast the spell. If they wanted it to be any weapon, they would have worded the spell differently.

Answer 2

Yes.

The spell specifically says:

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you.

The “weapon used in the spell’s casting” refers to the weapon used as a material component.