How can you link objects and move them along the same path in SpriteKit Xcode?

Question

iOS

I am making a game on SpriteKit for IOS (2D). It is necessary to implement the rotation of objects along a closed trajectory around the column (carousel). 4 objects rotate around the pole at the same time. Accordingly, you need to change the Zposition of the object approaching the pillar and away from the pillar, respectively. Running 4 objects simultaneously for rotation and tracking the position of each is problematic and very cumbersome. Plus, there is a problem that when simultaneously launching objects to move, they do not always reach the given position at the same time. The error is 1-2 pixels. Is it possible to bind objects in a spritekit and launch them along a given path? I know that you can build an ellipse and move objects around the graph, but I can't figure out how to connect them, so that they move one after another in a bunch and how to keep track of the position to change zPosition when moving? There is the concept of a navigation graph, but I did not find any detailed examples of its use. Prompt in what direction to search for the decision.