There are camera matching profiles for the "major" brands, these match the camera pretty well. Don't know about Ricoh. But note that these profiles are reverse-engineered just for visual appearance. Adobe has no access to the actual code or algorithms used - and even if they did, it wouldn't do any good. It's a different processing engine.
But we need to get one thing out of the way:
"to be able to keep "the original" picture"
There is no such thing as an "original picture". The raw file is not an image, it has to be processed first, and a range of parameters need to be set. The camera does this using pre-set and fixed parameters. That doesn't mean it's "correct" - it only means that's how the manufacturer thinks the image should look. There is no correct way to render an image. It's always an interpretation, a series of choices.
The whole point of shooting raw is that you decide, not the camera. That's what the sliders in Lightroom are for.
The raw file is just a data dump from the sensor. If you could see it directly, it would be a very dark, very flat and tonally compressed monochrome image. That's your original image. You'd hardly recognize it as an image and you wouldn't like it. To produce a useful image, a range of decisions have to be made. We shoot raw because we want to make those decisions.
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