Yes there is a huge difference between the concert and the other version, i’m used to the concert one (we have it in school) but they had the other one at a competition and it sounded much more quiet and the sound was quite dull. However, let me give you a very helpful piece of advice, never buy a harp, lever or pedal with nylon strings, always gut! Nylon strings are unnatural and don’t even resemble the beautiful sound of gut strings used for centuries.