[Sony Xperia 1 Guides, News, & Discussion] LouNGeRR:
Just upgraded from 55.1.A.3.107 to 55.1.A.3.149, while carefully documenting apps and their versions, including checking if disabled (uninstalled for user) system apps would stay disabled (they did).

Here are the changes on my EU/NL device:

10,11c10,11
< android.res.overlay_305 307.0
< android.res.overlay_310_504 307.0
---
> android.res.overlay_305 308.0
> android.res.overlay_310_504 308.0
14a15
> com.altice.android.myapps 1.3.3
23c24
< com.android.carrierconfig.res.overlay_305 307.0
---
> com.android.carrierconfig.res.overlay_305 308.0
27,28c28
< com.android.chrome 78.0.3904.96
< com.android.chrome 78.0.3904.96
---
> com.android.chrome 80.0.3987.99
70c70
< com.android.phone.res.overlay_310_504 307.0
---
> com.android.phone.res.overlay_310_504 308.0
79c79
< com.android.providers.partnerbookmarks.res.overlay_305 307.0
---
> com.android.providers.partnerbookmarks.res.overlay_305 308.0
81c81
< com.android.providers.settings.res.overlay_305 307.0
---
> com.android.providers.settings.res.overlay_305 308.0
125c125
< com.android.vending 17.6.19-all [0] [PR] 280955839
---
> com.android.vending 17.9.17-all [0] [PR] 284629082
155c155
< com.google.android.apps.messaging 4.8.058 (Lizard_RC13_xxhdpi.arm64-v8a.phone)
---
> com.google.android.apps.messaging 5.2.062 (Pegasus_RC17_xxhdpi.arm64-v8a.phone)
159c159
< com.google.android.apps.tachyon 67.0.281783362.DR67_RC10
---
> com.google.android.apps.tachyon 68.0.284888502.DR68_RC09
163c163
< com.google.android.apps.wellbeing 1.0.272729121
---
> com.google.android.apps.wellbeing 1.0.283573418
173,174c173
< com.google.android.documentsui q_release_aml_291600201
< com.google.android.documentsui q_release_aml_patch_291602000
---
> com.google.android.documentsui q_release_aml_patch_291602100
178c177
< com.google.android.gm 2019.11.03.280318276.release
---
> com.google.android.gm 2019.11.21.283644823.release
183c182
< com.google.android.googlequicksearchbox 10.85.11.21.arm64
---
> com.google.android.googlequicksearchbox 10.90.16.21.arm64
186c185
< com.google.android.ims 28.0.268933690-carrierservices_V28L_RC15
---
> com.google.android.ims 32.0.283645144-carrierservices_V32P_RC15
191c190
< com.google.android.modulemetadata 2020-01-01
---
> com.google.android.modulemetadata 2020-02-01
213c212
< com.google.android.trichromelibrary_390409638 78.0.3904.96
---
> com.google.android.trichromelibrary_398709933 80.0.3987.99
220c219
< com.google.android.tts 3.19.17.270646921
---
> com.google.android.tts 3.20.6.280280128
222,223c221,222
< com.google.android.videos 4.16.18
< com.google.android.webview 78.0.3904.96
---
> com.google.android.videos 4.17.34
> com.google.android.webview 80.0.3987.99
225c224
< com.google.android.youtube 14.47.50
---
> com.google.android.youtube 14.49.51
228a228
> com.google.ar.lens 1.10.191126026
230d229
< com.google.ar.lens 1.7.190611036
266a266
> com.sfr.android.sfrsport 6.6.1
275c275
< com.sonyericsson.android.camera.res.overlay_284 307.0
---
> com.sonyericsson.android.camera.res.overlay_284 308.0
295c295
< com.sonyericsson.setupwizard.res.overlay_305 307.0
---
> com.sonyericsson.setupwizard.res.overlay_305 308.0
300c300
< com.sonyericsson.textinput.uxp.res.overlay_305 307.0
---
> com.sonyericsson.textinput.uxp.res.overlay_305 308.0
308c308
< com.sonymobile.android.contacts.res.overlay_305 307.0
---
> com.sonymobile.android.contacts.res.overlay_305 308.0
310c310
< com.sonymobile.android.dialer.res.overlay_305 307.0
---
> com.sonymobile.android.dialer.res.overlay_305 308.0
334,336c334,336
< com.sonymobile.gameenhancer 2.1.A.0.24
< com.sonymobile.gameenhancer.browser 2.1.A.0.24
< com.sonymobile.gameenhancer.monitor 2.1.A.0.24
---
> com.sonymobile.gameenhancer 2.1.A.0.26
> com.sonymobile.gameenhancer.browser 2.1.A.0.26
> com.sonymobile.gameenhancer.monitor 2.1.A.0.26
400c400
< com.sonymobile.xperiasystemserver.res.overlay_305 307.0
---
> com.sonymobile.xperiasystemserver.res.overlay_305 308.0

New apps:

com.altice.android.myapps
com.sfr.android.sfrsport

Both seem to be related to RED by SFR, but for me they were disabled by default and can't find them anywhere on the phone.