[W810i RED49] R4EA031 MAIN with R4ED001 FS, compatible or not?

[Yippy]

I have been trying to find a Hong Kong firmware to debrand and change the language of my W810i RED49.

In the Downloads section, I found R4EA031_RED49 and W810_R4ED001_FS for most regions under the same R4EA031 folder.
(There are R4ED001_FS for many regions, but not a single R4ED001_MAIN.
On the other hand, there are R4EA031_MAIN for many regions, but only a few for R4EA031_FS.)
http://www.topsony.com/forum/local_links.php?catid=1468

Why are the R4ED001_FS's put in the R4EA031 folder?

Was R4ED001_FS designed to work with R4EA031_MAIN? (just a wild guess)
In other words, are they compatible?

By the way, I haven't flashed my phone yet, so it still has the default firmware from my wireless carrier (Rogers).
SEtool2 LITE reports MAPP CXC version R4EA031 and Default version R4ED001 for my phone, why are the versions different?

Also, can someone tell me which tool (XS++, SEtool2 LITE, etc) is best for completing a simple flashing task like mine?

Thanks.

Welcome to SEtool2 ( LITE edition ) v 1.11
supported DB2010/DB2012 CID49/50/51/52, DB2020 CID49/51/52
Loaded 51 flash descriptors

if you like LITE edition - please visit Index of ./ and buy FULL.

ChipID:8040,EMP protocol:0301
PHONE IS RED RETAIL PRODUCT
FLASH CID detected:49
Speed:921600
Flash ID check:897E
Flash props sent ok
OTP LOCKED:1 CID:49 PAF:1 IMEI:35657xxxxxxxxx CERT:RED
FLASH CID:49 COLOR:RED

Model:W810i
MAPP CXC article: R4EA031 prgCXC1250316_GENERIC_HN
MAPP CXC version: R4EA031
Language Package:ROGERS
CDA article: CDA102494/128
CDA version: R6A
Default article: cxc1250324
Default version: R4ED001

Network LOCKED
Operator: 302-72

USERCODE:0000

RESTORATION FILE PRESENT FOR DETECTED FIRMWARE

Elapsed:14 secs.