Sonoff POWR316 vs POWR320: comparison, relay application, current measurement, sub-metering

Hi
Has anyone of you had the opportunity to compare these 2 devices as in the topic from the inside?
I know that one of them has a permissible current of 16A and the other 20A.
From the information I found on the internet, the difference is (I think) only in the type of relay used.
I would like to use these modules only for measurements, so the relay will not be used.
At home I have an old type single-phase installation with 20A main protection and now the main question is whether after bridging the relay and possibly thickening the tracks I can use the 16A version as the main sub-meter? I would like to use them for measurements upstream and downstream of a 3.5KW inverter

At the moment I am using 3 of these for measurements on smaller circuits with the software changed to EspHome and relays switched on permanently by software and they work flawlessly.

I have found photos with a comparison of these models (with and without display) and yet there are differences. The question is whether they relate to the measuring circuits or maybe just the relay control?
316_32..jpg Download (312.92 kB) 316d_32...jpg Download (323.83 kB) 316_320_..p.jpg Download (185.08 kB) .