Yes, the 10Gb ports are 10Gb ports! Use them or access, dot1q/trunk, IRF, etc.
Maybe you were asking about the Dell 10Gb ports?
I can't see any reason why you couldn't use them as connections to the Dell storage. HP DACs are preferred (for support on the cable), but they will work with any compliant DAC or optic (1Gb or 10Gb). Check with Dell for any specific vendor ID support requirements they may have on their kit.