Transfer of Snow Leopard license from broken MacBook Pro
If it is a retail copy of Snow Leopard, then yes. If it is a machine copy, then probably not.

It's unlikely you'll have any problems installing it from a licensing perspective, there is no serialisation in Snow Leopard. You may run into strange problems down to the incorrect build of 10.6 for the hardware though as discs that come with machines are machine specific.

Snow Leopard is cheap though, you should buy it if you think you need to!