Windows 7: will key work with Win 7 home premium SP1 DVD also?

i have a quick question if someone knows this for sure. I have a legal Windows 7 home premium DVD OEM with a key. If I can get my hands of the same DVD but with SP1 included!!!

Will my key for the non SP1 DVD work with the Win 7 SP1 DVD ?

Yes it should work. SP1 is just a higher maintenance level.

Yes, until you can find a Windows 7 SP1 DVD, you can slipstream SP1 into your current DVD to use for reinstalls (but not Repair Installs): Slipstream Windows 7 SP1 into a Installation DVD or ISO File - Windows 7 Forums

My none service pack Home Premium key worked with an integrated SP1 DVD.

Should have no problems. If you check my specs, you will see that, besides Windows 7, I also run 2 installations of Vista, both SP1 (now SP2). I originally had a 32-bit Home Premium version of Vista, with no service pack. I decided that I wanted to try the 64-bit version, so after SP1 was available pre-integrated on retail discs, I bought the Ultimate edition. This came with both 64-bit and 32-bit discs. I installed the 64-bit version with the key that came with it, and then wondered if my key from the original Vista would also work, providing that I selected the correct version (I use the upgrade versions with the double-installation method). There was no problem with this, both versions activated without any problems.

I would expect that Windows 7 will be the same, although whether this will still apply when we have Windows 8 we shall have to wait and see.

Thank you for all your answers I just went from the old install with an windows 7 home premium english language and now have installed a fresh windows from a windows 7 home premium DVD with SP1 danish language.
It worked beautifully just like u said. I am so glad to have that version installed and legal :-) It just feels nicer when it's all legal :-) Thx again