A Buddha's Arahant Path is always associated with omniscient knowledges (sabbaññuta ñaña), but the Arahant Path of disciples is not. The Arahant Path of disciples comprises the enlightenment (bodhi) of the three types of disciples:
1) Chief Disciple Enlightenment..... (aggasãvaka bodhi)
2) Great Disciple Enlightenment..... (mahãsavaka bodhi)
3) Ordinary Disciple Enlightenment..... (pakatisãvaka bodhi)
The Arahant Path of disciples is sometimes associated with the Four Analytical Knowledges (patisambhidã ñaña); sometimes with the six direct knowledges (abhiññã); sometimes with the three direct knowledges (tevijja); or is sometimes a sure Arahant Path: either both ways liberated (ubatobhaga vimutta), or Wisdom liberated (pannã vimutta). But it is never associated with omniscient knowledge (sabbaññuta ñaña). Thus, for example, the Venerables sariputta's and Mahãmoggallana's Arahant paths were not associated with omniscient knowledge. A Buddha's Arahant Path, on the other hand, is not only associated with Omniscient Knowledge, but also all the other knowledges, as well as all special qualities of a Buddha.
Another thing is that Buddha's have, because of their matured paramis, attained the path, Fruition, and omniscient knowledges by themselves, without a teacher. But a disciple can only attain the Path and fruition knowledges by listening to Dhamma related to the Four Noble truths from a buddha, or a Buddha's disciple. They cannot practise by themselves, without a teacher..
