Hi there no the discs aren't all the same. There are 2 different formats in use for DVD's - and +. You need to know which ones your drive supports as you won't be able to use the other formats.
Have you checked sony's website using the model no. of the drive? You can find this out in device manager. Also you could consult the maker of your system.
If you have nero you can use the choose recorder option to check which discs your recorder supports.
Hope this helps