You can use Crochenit patterns with other double hooks, you just need to make a few adjustments as you go!
The Crochenit patterns are designed for a size M needle.  If you are using a double hook of a smaller size, your stitches will be tighter and your finished article will be heavier and will require more yarn.  Toys and clothing sizes will be different as well.  Depending on the look you want, you can make the adjustments as you go.  Make a sample swatch first to help you in making your adjustments.