My experience with replacing motherboard under any linux distro has always been positive. I've even gone from Intel to AMD, and the system came back up with ZERO changes needed by me. Quite easy! I hope you have the same experience (I think you will).
If you're SATA on both boards, and just basic VGA for the server, then it's likely the only thing you'll notice different is NIC mac addresses. If you MAC address is listed in your ifcfg-eth* scripts, then you'll need to modify that if you want your eth* devices to remain the same.