Domain Devotion

[Chrismith]

Regarding the domain devotion feats in Complete Champion, the text states that you can give up uses of turn undead to receive additional uses of the feat. However, two separate places in that section seem to say contradictory things about how this works.

Under the description of each feat, there is a variation on this text:

If you have the ability to turn or rebuke undead, you gain one additional daily use of this feat for each daily turn or rebuke use you expend.

At the beginning of the section, under "domain feats", there is this:

If you have the ability to turn or rebuke undead, you can gain additional daily uses of a domain feat's benefit by permanently sacrificing daily uses of that ability.

The first description makes it sound like these feats work similarly to divine feats, in that you can choose to channel turn undead uses into domain feat power on the fly. But the second description says that you have to permanently sacrifice a use of turn undead to gain an extra use of the feat.

So which is it? Do domain feats work like divine feats, or do you need to permanently give up turn undead uses to get extra domain feat uses?