The difference between 1st and 2nd Violins is very audible in the long samples, however it is not as audible in the short samples. That\'s why you can use 2nd Violins short bows with 1st Violin long bows and vice versa. You also have the VAR instruments, that allow you to change the timbre considerably.
Gary, Tom please correct me if I am wrong.
Jeannot is exactly right. The 1st and 2nd violin short bows are intended to be viewed together as a pool of resources for the construction of short bow passages. VAR does indeed supply a great deal of differentiation when needed.