It's not all over the place. Soul gets what you mean now.

In theory, the timelines wouldn't overlap unless a rift was opened, and the effects could be devastating. To use your example, something put under a tree at the base of a mountain in Autoro may not be there in Wintoro as the tree would be dead, and most likely decayed. Keeping with the mountain thing, Santoro is void of mountains due to the harsh winds/climate of the Santoro timeline. Continuing with this, there's no way to control which timeline you go between except for a rift.

Rifts are the only real way to cross between timelines in a controlled, but catastrophic, manner. With this, Soul's point is: no,that would most likely not be possible unless in the case of a GM-opened Rift.