As I'm in need of both camera and LTE I haven't tested either build other than early kernel tests so I can't say what the differences might be. Both threads have information in them though so you'd likely be able to read through and come to a conclusion as to which you want to try (or just try them both).
If you're in need of camera then you have to stay stock 3.2 as there is no camera support yet in CM9 builds. Also there has been no development of custom 3.2 ROMs for the LTE tab.
Unlikely. Hence me saying that the other links I pointed out were your only options.
You can TRY but it's very likely that the tablet won't even boot completely once you do.
I believe this isn't about the simple omission of a modem driver, and that differences go a bit deeper than that (kernel and more). I really have no clue though as I'm not a developer or programmer. All I know is others have tried wifi ROMs on these LTE tabs and failed, and that were it not for devs consciously supporting the LTE tab in the ROMs that I linked earlier we'd still be waiting for a taste of CM9 on our tabs.
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