It might be resampled, you might have drivers/utilities that add effects or "enhance" the sound, and the playback volume control will affect "what you hear" and what you record. And of course, if your computer "beeps" or makes other sounds, those sounds will be mixed-in.
WASAPI Loopback avoids some of these issues (at least playback volume doesn't affect recording volume) but I'm not sure that it's "digitally perfect".
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or if i am on youtube and record what you ear. Will it be equal as if i would download the mp3?
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If you record an MP3 (or other lossy format) while playing, it's been decompressed for playback, If make a new MP3 you are going through another generation of lossy compression. (If you save in a lossless format, that's not an issue.)
YouTube isn't MP3, so it will be "different". I'd
guess that a legitimate MP3 purchased from Amazon, etc., would have better quality.