Help with ET / Configurator recommends other ET, allegedly approved and tested

Servus, I’m facing a problem that I somehow didn’t find a liberating answer to, so don’t hit it right away, should there be a lot of similar questions I honestly didn’t find one that answered my question exactly. I’m looking for new rims for my Renault Megane III Grandtour 2.0 l 179 hp. Now I’ve looked at the original rims and a 7Jx17 CH5 ET49 on it. But now to the problem, as soon as I search my vehicle over HSN TSN, each rim gate gives me rims with 7Jx17 and also 5×114.3 but also with other injection depths like ET50 or ET40, but supposedly allowed on my car and if I change the ET49, there is a different hole circle usually 5×112. But now I think to know that you can’t change the ET without papers and testing. And 5×112 doesn’t fit if it has to be 5×114, so I can just take the recommended rims with other ET? How does this deviation feel, I can still get another ET without thinking about it. ellen, can someone clarify that? Thank you!