The world of tone is a vast one... There are a ton more differences between acoustic guitars besides just whether it's a classical or otherwise. Classical guitars are just another different body style of acoustic guitars... The guy on the right in that video is playing what's called a dreadnought style acoustic... A dreadnought is characterised by the shape of the body... It's bigger than a standard classical guitar but has the same "no cut away body style" as a classical... Dreadnoughts also are steel string acoustics where as most classicals use nylon strings... This is what gives a classical it's "classical" tone.... The guy on the left in the video that you linked to is playing what is most commonly known as a Grand Auditorium style guitar... Which is bigger still than a dreadnought and they often have a single cut away for easier access to the higher frets... These are also steel string guitars... There are other different body shapes that may dictate the tone of the guiar as well... such as Jumbo acoustics... which are larger body guitar with a lot of resonance... there are steel string dobros or resonators as they are often called which have a steel cone where the tone hole generally is... This cone gives them a distinctivly steel twangy sound... normally these guitars are played with open tunings and played with a slide... Now that we've looked at the difference in body shapes... which dictates the tone of a guitar... We can look at other aspects of an acoustic guitar that will dictate the specific tone of that guitar.... The woods of the guitar are very important to which tone the guitar will give off... the most common wood for the top (or soundboard) of the guitar is spruce... about 70% of acoustic guitars have a spruce top... because it is a middle of the road tone wood that can convey deep tones as well as bright tones...... This wood is more for projection purposes rather than pure tone... The top of the guitar is called the "soundboard" because it's mechanical purpose is to project the sound... rather than defining the way the guitar sounds... That is more the job of the back and side woods.... the backs and sides of acoustics can be made of all kinds of woods depending on what tone you want... common ones are maple, mahogany, and koa... Koa is an exotic tone wood that is very similar to mahogany but has a different, more aesthetic grain structure.... generally used in the place of mahogany on higher end guitars to give it an exotic look... So along with the tone woods of the backs and sides comes the structuring of the guitar.... Different companies have used different methods of building guitars for as long as guitars have been around... They follow the same basic concepts... but companies tend to do things differently based on what tone they're going for.... I'm not going to get much into it because the bracings and perfling of acoustics is generallly not something a guitar player needs to know... but the pattern of the bracing... whether it's a cross pattern... or x brace pattern... with the braces are scalloped or flat ended... the width/thickness of the bracing.... the specific location of the bracing... the width/thickness of the perfling... the space between the hatching on the perfling... all are things that can effect the way the guitar vibrates thus effecting the tone.... along with bracing and perfling comes the structure of the neck mount.... There are a few different ways that are commonly used to mount necks... some have been around for ages... developed by classical guitar luthiers long ago... but a few are more modern.. such as the method developed by Bob Taylor... He uses a dove tail hitch pattern with two mounting screws... rather than the adhesive hatch mounting that is commonly used by other companies... This makes neck transplants much easier...... Then there are the neck woods... mahogany is generally the most popular acoustic neck wood... There are others but mahogany or similar woods are normally used... A dense wood is a common neck wood. So the moral of the story as that there are numerous reasons why your guitar doesn't sound exactly like some other guitar... I didn't even mention the fact that the strings themselves can depict the brightness or warmth of your guitar.... Those things need to be understood so that you can understand tone as a whole.... Understanding what you like in tone is half the battle... the next thing is finding that tone...