Hi,
We may have misunderstand this last comment. The "error" you are seeing under the Config Tools is related to not generating the code. If we import an RTD example then open the same view, we will see a similar/same scenario than the one you are seeing, image below:

Once we click the "Update Code" button (circled in red on the previous image), we will stop seeing this "error":

This should be documented under the steps provided inside the "description.txt" file attached to each example project.
As for the previous "errors" you are mentioning, this step seems to be missing, which is to generate the code from Config Tools. All examples under the RTD/LLCE should be out-of-the-box. Emphasis in should be, since there are known issues under RTD v3.0.2 and LLCE v1.0.4 documented in this community.
As for the LLCE/RTD compatibility, each LLCE package contains a Release Notes, which mentions which RTD package it is compatible with. RTD will be the base of all the other packages, you need to take care of the compatibility of the other packages with your RTD.
We can also recommend using the "Automotive Software Package Manager" available under the S32G2 product page (link: S32G2 Safe and Secure Vehicle Network Processor | NXP Semiconductors) since it provides bundles where all packages should be compatible one with the others.
Please, let us know.