u/HersheyStains

I have a flight from Venice -> Madrid -> DFW, all bought on single Iberia ticket from their website. My connection time in Madrid is 75 mins. After some research it seems I have to transfer from T4 to T4S and then go through Passport Control as a non-eu citizen and then to the DFW gate. Is 75 mins enough? I'm not checking any bags. I called Iberia support and they seemed not worried about it at all. I noticed there is a flight from Venice to Madrid 6 hours earlier. I'm not sure if they would let me move to that flight or not.

Thank you for any help.