There is no reason for the proportions to be the same
Not exactly the same, but not even so different!
You suggest to use the Designer, its Anchors and do some adjustment using the scripts.
Games graphics are not relevant to the designer layouts.
However as this is about the 10th thread that Luca is creating about the exact same topic, I will not answer in this thread any more.
You're right, don't answer. There are 10h thread like this from me and 100h questions about this from 10h members.
But I can say the Designer DOES NOT WORK AS EXPECTED.
I know perfecty the question of different ratio between different screens, but all developers (not me only) wanted to get a scaled (with minor diffences) their layouts. EVER.
I can stop this question, but, as the title... it is endless!