Can you stack the damage bonus from these two feats together?

[Krunchyfrogg]

Slashing Grace and Fencing Grace?

OR

Slashing Grace and Dervish Dance?

I doubt you can, but I just felt the need to check.

Thanks!

[Bob Bob Bob]

None of those feats provide a damage bonus. All of them say "you can add your Dexterity modifier instead of your Strength modifier to that weapon's damage." (well, technically Dervish Dance is a little different but the effect is the same). You're just replacing Strength with Dexterity, nothing "bonus" is added.

[Krunchyfrogg]

Thanks. This is what "brainstorming" does when you're over tired. :p

[Imbicatus]

Specifically, there is a FAQ that explicitly disallows you from adding an untyped bonus equal to an ability modifier twice.