U.n.k.n.o.w.n.
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Giving an effect from a spellbook (or from all 4 types of magic) that is enhanced with additional features, along with stats, in exchange for a simple artifact is an example of something that goes beyond the limits of balance. Therefore, it shouldn't be included in the multiplayer version.
The bonuses from the Wisdom and/or Secret Knowledge skills, or stats, can be removed, but it's still better to leave at least one of them, since the Tome of Power is included in the set. Decide for yourselves what to remove/leave.
Added 11 minutes later
You could also make it so that existing sets (from the original game) merge into one item with corresponding names, e.g., Dragon Strength, Sar-Issa Regalia, Embrace of Death, etc.