I'm familiar with the research in this area, and that's not something you can say confidently; most work (and by that I mean 2 or 3 papers in total) has gone into investigating the role 'generated' depictions of CSAM play in the collections of hoarders. No psychological study, as far as I'm aware, has conducted an investigation on those who enjoy cartoon material akin to what you might find in a Japanese manga.
In fact, there's some evidence against what you're saying; anthropological research on fans of cartoon material ('lolicons' or 'shotacons') in Japan shows that their communities draw hard lines between '2D' and '3D' not just in this area of sexuality, but in their sexualities as a whole. This sexual inclination toward the 2D world is termed the 2D-complex and is akin to 'digital sexuality' or fictophilia, not pedophilia.
By way of analogy, perhaps BDSM would work as a good counter point to you. Many people (some studies suggest the majority of people) engage in 'rape fantasies' or other such fantasies of illegal or immoral nature, yet although actual depiction of rape is rightly banned by the state, its simulated variants are not, and we are comfortable to acknowledge that sexual desires do not always manifest in real life, and sometimes the thrill of fantasy itself is the attraction. To make it real would, ironically, defeat the whole point.