It may have the same instruments - like Piano and Violin, but the Piano will sound slightly different, just like if you go to real pianos and one is a 9 foot grand, and another is an upright, and another is a cheap spinet, etc. synthesizer, it's going to sound different on all of them.
If you play the same exact MIDI file on a Yamaha, Roland, Korg, Kawai, etc. Many of the ones made by amateurs play back like an amateur. MIDI files can be made by anyone, so not all of them are professionally done.
A MIDI file is 'instructions' for the synthesizer to play the music.īut if you've ever bought anything with a manual, you'll know some manuals are very well-written and others are not!