First, I have never heard of anybody transplanting corn after it comes up. Why in the world are you doing that? Get you one of those cheap walk behind planters and put the seed in the ground.
Corn types will cross pollinate. You can read on the seed company's websites and each variety will have a maturation time and instructions as to how far it must be from other types. I solved this problem when I had five or six different varieties in one garden by planting the quickest maturing first, Early Sunglow at 59 days. Then the next shortest maturing time type a week later and so on until the last which was a 129 day type. I may have the times wrong because I am doing this from memory. Anyway I don't think I ever had cross pollination problems. BUT if at all possible do not plant different types close to each other. And corn is wind pollinated. I have always been told and read that you need a minimum or eight rows for successful pollination. If fewer than that keep the plot as close to square as possible.
Corn does not like a hardpan where the ground has been broke repeatedly at the same depth. One of the most successful row cropping corn farmers I ever knew stayed with a six row planter long after everybody else in the area had gone to twelve or more rows. He had the planter rows lined up behind the teeth of a huge ripper and pulled it behind a large four wheel drive tractor. I remember a neighbor borrowing the ripper and his 130-hp 1466 International would not pull it. The point is to tear that hardpan up.
After our last large garden we have stopped growing corn because it is easier to buy it at the local trade day. And the last time with all the different varieties coming in every two weeks it seemed like all we did that summer was pull corn.
And my wife forbid me to buy any other seed except Honey Select Triple Sweet. It was the favorite of everybody who tried it.
Riddle: How do you know when your sweet corn is ready to be pulled?
Answer: When you go to your garden one morning and the coons have ate most of it.
RSKY