RE: How does big two stroke engine sounds like ?
By nature, two strokes and four strokes have different sounds, with the two stroke's snappy exhaust period, and lack of parts in the exhaust duct being the main reason.
The fourstroke has the piston pushing gas out of the cylinder, which is lacking in the two stroke, so no, they will never sound the same. The difference can also be well seen in a terz analisys of the sound. Level differences in adjacent tertz bands are much larger in two stroke engines, causing the typical two stroke noise.