TensorRT version mismatch in NGC 23.04 container (8.6.1 vs 8.6.1.2)

[Garfield2005]

The NVIDIA container release notes state that the 23.04 container uses TensorRT 8.6.1:
https://docs.nvidia.com/deeplearning/frameworks/container-release-notes/index.html#rel-23-04

However, inside the container, running:

dpkg -l | grep tensorrt

shows the installed TensorRT version as 8.6.1.2.

Is this expected?
Is 8.6.1.2 a patch/build revision of TensorRT 8.6.1, or is there a documentation mismatch?

Thanks.

[Garfield2005]

An engine file built with TensorRT 8.6.1.2 cannot be used in a TensorRT 8.6.1.6 environment. Is this expected behavior?