Apart from the visual appearance there is no difference between magic mushrooms and magic truffles. The so-called truffles are objectively no real truffle (as those belong to the genus Tuber), but sclerotia of psilocybe mushrooms growing below the ground. Therefore, they are nothing more than an underground part of the fungus and completely identical to the part above the ground, the so-called fruiting body, which we call the actual mushroom. Both contain the hallucinogenic molecules psilocybin, psilocin and baeocystin, both are absolutely effective.
The experience you can expect with magic truffles is absolutely identical to the one induced by magic mushrooms. Eventually, in both forms of fungi, the combination of ingredients psilocybin, psilocin and baeocystin/norbaeocystin is effective - mushroom and sclerotium are eventually the carriers of the psychoactive substances.
There is in fact no difference between magic truffles and magic mushrooms. They are parts of one and the same organism. Sometimes it is said sclerotia contained a higher amount of active compounds than a fruiting body. Until today, this statement is scientifically not proven.