Default [Q] G2 Variants and their firmware parts - ROM/Kernel and Modem...

I've to admit I'm new to LG phones and quickly got myself confused after digging into a few informative posts here...

Some basic questions - please help!

Swapping Modem/Base-Band:
If flash a D802 international Modem to sprint LS980, will it work with the sprint stock rom? Does this mean G2 LS980 version converted to D802 and later can be restored back to LS980 stock, or differences between some of those G2 variants are just in their Modem & ROM?
(When traveling abroad, I was able to flash my old moto photon back and forth with foreign and sprint modems and all worked well with its rom remained the same. )

LG stock KDZ firmware:
besides ROM(the Linux OS or kernel/boot-loader etc.), does a KDZ package include Modem(radio) as well?

Related posts:

Flashable Modem Zips [All G2 Variants]

LG G2 Stock Firmware (Go Back to Stock)

Alternative method to download Stock Firmware

[GUIDE] HOWTO: Install an International LG G2 D802 ROM on the T-Mobile LG G2 D801.

CAREFUL WHEN FLASHING LG - model: LG-D801 (note: op has WIND ROM)

LG G2 siblings

AT&T - D800
GSM 850/900/1800/1900
UMTS 850/1900/2100
LTE 1900(2)/1700(4)/850(5)/700(17)

Sprint - LS980
GSM 850/1900
CDMA 800/850/1900
UMTS 850/1900
LTE 1900(25)/800(26)/2500(41)

T-Mobile - D801
GSM 850/900/1800/1900
UMTS 850/1700/1900/2100
LTE 1900(2)/1700(4)/700(17)

Verizon - VS980
GSM 850/900/1800/1900
CDMA 850/1900
UMTS 850/900/1900/2100
LTE 1700(4)/700(13)

Global version - D802
GSM 850/900/1800/1900
UMTS 850/900/1900/2100
LTE 800/900/1800/2100/2600

Canadian version - D803
GSM 850/900/1800/1900
UMTS 850/1900/2100
LTE 700,AWS(1700?),2600

Latin America version - D805
GSM 850/900/1800/1900
UMTS 850/900/1900/2100
LTE 700/1700/2600