Confidence means - if there is a vote of no confidence in the PM-ship they will vote for confidence. Ie prevent any motion of no confidence nonsense.
Ok, so they stand by the Govt. What about when say there are 5 bills to be voted on, does this confidence extend to supporting those?
That's not confidence thgat's supply of votes.
These are usually pre negotiated on what they will supply what they will abstain and what they will oppose, and all signed on the dotted lines so they both know where they stabnd. So the answer is depends on what's signed.