Programming an 8Mhz Arduino RBBB with a 16Mhz Duemilanove

Hey Peeps,
For my current project, I want to run the Arduino at 3.3V so that I can build only one power supply and natively communicate with other 3.3V devices, so I also need to drop the clock speed to 8MHz. I've got a Duemilanove with 16MHz clock. The board that I'm programming is a RBBB clone.

My question is, when using an Arduino as an ISP, do I use an 16Mhz resonator on the target board (so that they'll be at the same clock speed while programming), or an 8MHz resonator (since that's what I intend to use it with).

Thanks for the help!

Use directly 8MHz.

Thanks, I flashed the bootloader using the 8Mhz resonator and it's now working!