Go to the cheat sheet in my signature and read up on getting your LG set up and stable. Do that with the new one before you transfer the eggs over- give it 24 hours at the right temp before you move them, and then DON'T LOOK after you move them. The temp will go high and low and all over and you'll feel compelled to adjust, but you MUSTN'T adjust. It will stabilize. It will.
Best of luck! They can survive a heck of a lot more than we think, and I hope you get some puffy peeps!