Substituting these MOSFETs?

I posted this a little earlier but I'm not sure if was posted but it was in the wrong section anyway. I wanted to know if I could use **broken link removed** instead of **broken link removed**. And if I can would I still need to use zener diodes in my circuit as they're 'Zener Protected'.

I'll be using them for a plasma speaker close to this teravolt schematic: **broken link removed**

Thanks.