[Q] Updating to newer Build of same custom rom - Android Q&A, Help & Troubleshooting

Hello,
I have 2 (newbie) questions on how to update to a newer Build of the same custom Rom.
1.) Do I have to flash the new boot.img in the new Build zip or can I keep the boot.img from the previous Build I flashed before?
2.) If I back up my device with NanDroid in CWM and restore it after the installation of the new Build, will the device be completely be set up as it was in the previous installation (including home screens, log-ins,...)?
Device: Sony Ericsson Xperia Mini (st15i, "smultron")
custom rom: http://forum.xda-developers.com/showthread.php?t=2032900
Thanks

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