I would mark them so you can tell them apart and put them in together.My second batch of the shipped Bielefelder hatch egg's just arrived here this morning, so they have been unpacked and are resting. I do have more then one incubator, but I'm wondering if it will hurt to put them in with that first batch. I set the first batch on Tuesday, and this second batch goes in tomorrow (Saturday). That's only 4 day's difference.