[Milestone XT720 Android Development] peshovec:
That seems very strange, i was curious and run some diffs on uk and ce (both latest versions). there was some very minor (irrelevant) differences.

So may be a version dump is the root cause

differences are in CG36.img and CG39.img

CG36.img:

diff -r sbf_uk/aha36/ sbf_ce/aha36/
diff -r sbf_uk/aha36//comm_drv/mmins_cust_emergency_number.cfg sbf_ce/aha36//comm_drv/mmins_cust_emergency_number.cfg
1d0
< 0x390x390x390x00
\ No newline at end of file
diff -r sbf_uk/aha36//com.motorola.widget.weather.accuweather/weather_setting.mkitso sbf_ce/aha36//com.motorola.widget.weather.accuweather/weather_setting.mkitso
1d0
< CityCode=EUR|UK|UK241|LONDON
3,4d1
< StateName=United Kingdom(Westminster, England)
< CityName=London

so nothing special at all

in the system (CG39.img):

diff -r sbf_uk/aha sbf_ce/aha
Only in sbf_ce/aha/app: GreekIME.apk
Only in sbf_ce/aha/app: LatinIME.apk
Binary files sbf_uk/aha/app/MotoHome.apk and sbf_ce/aha/app/MotoHome.apk differ
Only in sbf_uk/aha/app: VoiceSearchWithKeyboard.apk
diff -r sbf_uk/aha/build.prop sbf_ce/aha/build.prop
5c5
< ro.build.version.incremental=1279635677
---
> ro.build.version.incremental=1279085279
18c18
< ro.product.name=STR_RTGB
---
> ro.product.name=STR_RTCEE
31,32c31,32
< ro.build.description=str-user 2.1-update1 STR_U2_01.1E.0 1279635677 release-keys
< ro.build.fingerprint=Motorola/STR_RTGB/sholest/sholes:2.1-update1/STR_U2_01.1E.0/1279635677:user/release-keys
---
> ro.build.description=str-user 2.1-update1 STR_U2_01.1E.0 1279085279 release-keys
> ro.build.fingerprint=Motorola/STR_RTCEE/sholest/sholes:2.1-update1/STR_U2_01.1E.0/1279085279:user/release-keys
diff -r sbf_uk/aha/default.prop sbf_ce/aha/default.prop
1,2c1,2
< ro.build.config.version=GAS_EMEA_UCASHOTBRTLRTGB_P021
< ro.build.config.date=Tue Jul 20 09:21:17 -0500 2010
---
> ro.build.config.version=GAS_EMEA_UCASHOTBRTLRTCEE_P001
> ro.build.config.date=Wed Jul 14 00:27:59 -0500 2010
6c6
< persist.sys.timezone=Europe/London
---
> persist.sys.timezone=Europe/Berlin
diff -r sbf_uk/aha/etc/apns-conf.xml sbf_ce/aha/etc/apns-conf.xml
5d4
< <apn mnc='03' mcc='214' port='8080' carrier='OrangeWorld' proxy='10.132.61.10' type='default' user='orange' password='orange' apn='orangeworld'/>
358c357
< <apn mmsport='8008' mnc='01' mcc='262' carrier='T-Mobile (DE)' mmsc='http://mms.t-mobile.de/servlets/mms' mmsproxy='172.028.023.131' user='t-mobile' password='tm' apn='internet.t-mobile'/>
---
> <apn mmsport='8008' mnc='01' mcc='262' carrier='T-Mobile (DE)' mmsc='http://mms.t-mobile.de/servlets/mms' mmsproxy='172.028.023.131' user='t-mobile' password='tm' apn='internet.t-mobile�'/>
diff -r sbf_uk/aha/etc/motorola/comm_drv/mmins_cust_emergency_number.cfg sbf_ce/aha/etc/motorola/comm_drv/mmins_cust_emergency_number.cfg
1d0
< 0x390x390x390x00
\ No newline at end of file
diff -r sbf_uk/aha/etc/motorola/com.motorola.widget.weather.accuweather/weather_setting.mkitso sbf_ce/aha/etc/motorola/com.motorola.widget.weather.accuweather/weather_setting.mkitso
1d0
< CityCode=EUR|UK|UK241|LONDON
3,4d1
< StateName=United Kingdom(Westminster, England)
< CityName=London
Binary files sbf_uk/aha/framework/framework-res.apk and sbf_ce/aha/framework/framework-res.apk differ

interesting stuff is framework/framework-res.apk and the other apk (MotoHome for example), but both of them are equal after unziping (suppose, different signing keys is the difference