Gazebo provides different world pose between two simulation instances

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In general Gazebo is non-deterministic, as there are multiple threads running concurrently and some components (e.g.: physics engines) with a non-deterministic nature. In your particular example, it's probably the physics engine (ODE by default) the one that potentially has some non-determinism. My two suggestions are:

1. Launch Gazebo with the --seed <value> argument using the same VALUE in both instances.

http://gazebosim.org/tutorials?tut=ra...

1. If that doesn't work try using a different physics engine (Gazebo supports multiple ones). Maybe for your example that physics engine is deterministic.