For these screenshots I didn’t apply a filter so you can see the raw image.
#1 was take at the 1560 x 720 resolution.
#2 was take at the 2340 x 1080 resolution.
#3 was take at the 3120 x 1440 resolution.
The 2nd & 3rd screenshot appear to be showing the same resolution though.
#4 has your 1080p shadow mask shader applied to the phone resolution of 1560 x 720.
#5 has your 1080p shadow mask shader applied to the phone resolution of 2340 x 1080.
Hopefully these screenshots show up ok. If you need me to upload them somewhere, please let me know.