Caster and archtype shields

[Keraki]

I was building a support cleric with a bard archtype when I noticed they have the shield spell. My question is this:

If in turn 1 I cast shield and before my next turn I use shield block; does

A) On turn 2 i can use shield from my other spell list or,

B) Wasted a learned camteip because they share the same 10 min cooldown.

Interested in the RAW and personal opinions.

Assuming RAW its B, but not quite sure.

[HumbleGamer]

It's the same cantrip.

The fact you get it through a tradition rather than another doesn't matter.