yea there is some difference , here is some pictures i posted before , 1G DSM is similiar to vr4 as the 2G DSM is more to evo ..
1G has bigger intake ports & tb if not mistaken :)
http://www.fivio.com/vestax/vr4/1G-2G_Intake1.jpg
http://www.fivio.com/vestax/vr4/1G-2G_Intake2.jpg
http://www.fivio.com/vestax/vr4/1G-2G_TBs.jpg
http://www.vfaq.com/proj-pics/RRE/2G-head_int.jpg
http://www.vfaq.com/proj-pics/exh-mans01.jpg
http://www.vfaq.com/proj-pics/exh-mans02.jpg
http://www.vfaq.com/proj-pics/exh-mans03.jpg
http://www.vfaq.com/proj-pics/exh-mans04.jpg
1G has bigger intake ports & tb if not mistaken :)
http://www.fivio.com/vestax/vr4/1G-2G_Intake1.jpg
http://www.fivio.com/vestax/vr4/1G-2G_Intake2.jpg
http://www.fivio.com/vestax/vr4/1G-2G_TBs.jpg
http://www.vfaq.com/proj-pics/RRE/2G-head_int.jpg
http://www.vfaq.com/proj-pics/exh-mans01.jpg
http://www.vfaq.com/proj-pics/exh-mans02.jpg
http://www.vfaq.com/proj-pics/exh-mans03.jpg
http://www.vfaq.com/proj-pics/exh-mans04.jpg