I kinda laughed out how Madara reacted to Kabuto bringing back Yamato instead of Naruto. It wasn't exactly the reaction I would have expected. Oh geez, that's not exactly the guy I told you to bring back." Good on you, Madara, for being an understanding boss.
Anyway, lava/magma is known to harden after some time, so the techniques that the Mizukage and Kurotsuchi use could very well be the result of the same Bloodline Limit. And hell, she should be able to control how her techniques manifest when she uses it anyway. When the Mizukage used her lava/magma technique, it melted, then sealed off a wall. So yea, I think the techniques are of the same Bloodline Limit.