First of all, the second snippet you’ve attached here is in Japanese, not Korean..so can’t really help you much here.
I’d suggest waiting until the actual release to get more accurate info, as skill descriptions and details (percentage, mechanism, etc) tend to differ quite a bit between the leaked & released
To me personally though, I think the second one (recovering the cover’s hp) makes much more sense than recovering Nikke’s hp by percentage of cover’s hp.
Most likely the “as HP” at the end of the English version is some sort of mistranslation.
The Korean version simply states that the skill will recover the cover’s hp (and based on what others translated above, the Japanese version also does too).
In short, second one is the correct version & it will only recover the cover’s hp if that’s what you were wondering