Upfront, I will say that I know very little about the UDV. The rituals of the groups are different, but the core belief of each is based upon daime as a sacrament. Mestre Irineu (Santo Daime) and Mestre Gabriel (UDV) came to the daime through distinct and separate paths, however.

As to the differences between Cefluris and other groups which have descended from the Mestre Irineu lineage... well, that's a fairly long story. When Mestre was alive, there was at first one group. He was a strong leader, but not given to dictating, so through the strength of his personality it all kept together. However, somewhere along the line his first musician (Daniel Periera) received a vision to start another daime church, and did so with Mestre's blessing. This is the Barquinha. It's available only in Brazil, as far as I know, and only in a few locations. The Barquinha relies heavliy on music, too, but the uniforms and forms of the ritual are different.

When Mestre Irineu passed, there was great turmoil in the Daime community in Rio Branco. Padrinho Sebastiao (Cefluris) left and took a fairly large group with him into the rainforest to nurture his vision (descended from Mestre, but most surely his). The Cefluris community follows the rituals that Mestre left, but as with any situation where a group becomes isolated, some differences crept in. Whether you consider these differences major or minor is still at times the subject of some debate. Cefluris also recognizes a number of additional important people (Pad. Alfredo, etc) which the Alto Santo groups (Mestre's original followers and their descendents) do not.

Cefluris is the branch of the daime that has been spread around the world, so if you come in contact with the daime outside of Rio Branco, it is likely to be a Cefluris church. Some of the original followers (Alto Santo) believe this to be contrary to Mestre's wishes, so in fact the chance to drink outside of Rio Branco is one big bone of contention.

Schism seems to be a feature of the daime (as opposed to a bug). The daime shakes people and organizations. Stuff is bound to break loose.