No. Baseband/radio/modem is not specific to a particular ROM, but rather to a carrier or a country/area. Most ROMs don't include a baseband, so when you flash a ROM, your original baseband stays unchanged. Unless there is an indication that a particular baseband would be a better choice for that ROM, you should be good with what you've got.
You WILL reflash your baseband if you flash a stock KDZ, because KDZ image replaces everything, including bootloader, baseband, and recovery.
Yes, it should work. I personally couldn't make 4.4 work with my Korean baseband, but it's related to the F180 -> E975 "conversion", which is messy, and is known to cause some weird issues. For the actual E975 (or other non-Korean variants), it should be just fine.
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