Using images created using v2.5 under a 3.x license?

Hi,

I have 20 computers that were configured using the same "standard" image created using GSS 2.5. I currently have 20 licenses for GSS 2.5 for these computers. I will eventually need to image 10 new computers and therefore need to purchase new licenses. If I purchase GSS 3.x, can I still use the same standard image I have been using? Please note, these computers are not connected to the internet so I am unable to do any upgrading.

(If this is covered in the EULA somewhere please point it out to me.)

Thanks!