As for your question. Idea Blood is indeed similar to Reality Marbles. In fact, many suspect that the many Reality Marbles used by the Ancestors have been replaced by this concept. The kanji used for writing Idea Blood (原理血戒) also sounds vaguely similar to the kanji used for writing Reality Marble (固有結界).
That said, it is not entirely the same. A reality marble is at the end of the day, a Bounded Field. It will eventually disperse through the pressure put upon it by the world. But Idea Blood is not that easy to get rid of. It is 'a poison that infringes upon the world'. Vlov has to actually suppress it
himself by desperately consuming human blood as "heat" to counter its "cold" (in his case). Once unleashed, Vlov himself is not exempt from its effects. He can't move very fast, and is always assaulted by a feeling of terrible cold.
I could also recommend reading
this post by me, which has translations of most of the explanation given in the game about Idea Blood.