[Q] Updating Custom ROM via Built-in Software Update

I have searched for this simple question, but have yet to find an answer.

I have a custom Android 4.2.2 ROM (for my SGH-I337M) (I cannot provide a link as this is my first post) and I have received a notification asking me to update to the latest version on Android (4.3). I would, but I'm not sure if it is safe to do so via this method. The main reason I have not done this is because after installing this ROM, my model number changed for SGH-I337M to GT-i9505. By doing this, my reasoning is that the update downloaded is for the GT-i9505 and may not be compatible.
Now for the question, is it safe to update my phone this way?

The main reason I'm not using the Android 4.3 link is that my Mobile Network State will not change from Disconnected in that ROM.

While I'm at it I may as well ask this. If I do update this way, and it doesn't work, would a simply recovery from TWRP be OK?

Thanks in advance, and my apologies if I have posted this in the wrong section, I could not find one that was specific to my issue.

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