Should I change the rear shocks?

[Maxim Gatsuts <maxim@hugo.kiev.ua>]

Hi fellow listers!

Thanks to all of you who responded on my post about parts compartibility.
I am slowly changing suspension and drivetrain of my '85 Audi 80
Quattro. Now it is a turn to change a coil springs. When I've bought this
car it has a set of blue (lower) springs. Now I am going to change it
to normal high springs. Concerning this my questions:

1. Does lower springs usually comes with special (lower?) shocks?
2. When I will change springs to normal high should I also change
shocks to normal?
3. What can happen if I will not change shocks? It will saves my money
especially taking into account that old shocks are OK.

I am asking only about rear shocks because I've changed front to normal
before I found out that my springs are short (they are still working
anyway).

With best regards

Maxim
Kiev, Ukraine
'85 Audi 80 Quattro