Yes sir, this is totally fine. Cyp has a slightly longer ester than test e, but I don't think you will notice a difference. I combine different esters all the time, or switch from one ester to another. The only time you may find issues with a flux in hormone is if you were going from a fast acting test like prop, to a slower acting test like cyp. In that case, I would slowly transfer over. First adding in some cyp to my weekly shots, then slowly increasing as I phased the prop out. But in your situation, you will be just fine going straight from one ester to the other.