camera matrix differs from given example in ROS

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Of course it differs, even if you use two similar cameras the result would probably be slightly different. Those values describe

• The properties of the lens mounted on the camera
• The pixel size on the CMOS sensor and the offset of the central point

It is impossible to say if the results are acceptable or not, the only thing you can do is to check the reprojection error showed by your calibration program (the smaller the better) and to take a look at the undistorted image. Try to point your camera at straight lines in the real world (in the ceiling or floor for example), they should still appear as straight lines in your undistorted image and the distortion observed on the raw image should have been rectified.

And those values seem to be normal values, nothing weird.

Read this introduction for a better understanding of your camera.