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It's as simple as: Right click on the submodel in the step list → rename. I don't know, why I didn't see this earlier. I would bet, I tried that before. ;-)

In Bricklink Studio go to File > Export As > Export as LDraw... Open the file in any text editor such as Notepad Find the Bricklink part ID you want to replace it. It will be a number followed by a .dat extension. If you have multiple identical bricks with different colours, check the colour id in the second column. Bricklink has a list of colour ids ...

According to SylvainLS in this BrickLink post, these are the answers to my questions: You can find out which colors are available for a part by selecting a part, opening the Color Palette on the right side of the interface, and selecting the Hide unavailable colors option. In the BrickLink catalog, part 99455 and many other EV3-specific pieces are set to ...

There is a 3D model available on Mecabricks, which can be viewed, edited or exported into various formats, if one of these fits your use case.

The BrickLink gallery also includes a number of builds of official sets, however many of them aren't titled with the set name, but may include it in the description. Sadly there also doesn't appear to be any versions of 31120 yet. You could download the instructions and have the fun of virtually building it yourself ;)

I usually check at Eurobricks forums, as they have "Official Lego sets made in LDraw" topic, where community share LDraw files for digitally built LEGO sets. The list of available sets is rather limited since this a community effort after all. At this point of time I couldn't find files for 31120 on EB yet.

Please note that I think that software preference can very often be based on many factors that are difficult to enumerate and sometimes even more difficult to express. That said, I think there are a few important differences between the two specific pieces of software that you referenced that could be useful for answering your question. (Also note that my ...