tomato question

I have pea tomatoes and New Yorker (an early beafsteak type) Tomatoes growing within ten feet of each other. I wish I planned this better, it occurred to me that there might be an issue with cross pollination. I really want to save the seeds of both varieties for next year. Should I be worried about this?

Tomatoes self pollinate. Very rarely will varieties cross pollinate. You should be fine.

You could also put something over a flower before it opens, give the plant a shake and leave the protection over the flower until the fruit starts to grow from it. You would then have to mark that tomato to remember which one it is until ripened to the seed saving stage.