unknown's feed

So is the Slime and the OgMl is the same or not? Because some says that perhaps the slime ate the OgMl knowing the the Mc needs to marry him.

But being honest, I feel like the OgMl is the slime because in the first time they met, the slime blushes when our Mc want to atleast kiss the OgMl. Not to mention that on the book (Ch 5), it states that a high level of monster can turn into a slime once their magic exhaust. Wouldn't that make sense knowing that the OgMl is great with magic and the slime was found in a place where there's a high-level monster that a mere slime can't survive? ╥﹏╥