Q: Is their any significance to making dua between the two Jumma khutbas?
A: Shaykh Abdul Haq Muhaddith Dehlawi (Rahmatullaahi Alayh) has mentioned in his book Safarus Sa'aadat (according to an opinion) that the time of acceptance of Du'aa is from the time the Khutbah commences till the completion of the Salaah. (Deen ki Baatein P145). So Du'aa can be made during the break of the two Khutbahs, but should be made in the mind.
Allah Ta'aala knows best.
Moulana Yusuf Laher