I figured that was the case, I should have weighed them straight out of the freezer to see how much more they would loose as they cure. I don't think I'll notice a difference in lather though, young castile and old castile feel the same to me.
I have another type in the freezer but it was cured before going in. I used peanut oil and was concerned about DOS, nothing to worry about it seems as the one bar I left out didn't go rancid and its probably close to a year old.
I guess in the end, I didn't see much of a difference except in the case of the DOS prone castile and I knew it was starting to turn before I froze it.