I would pronounce them differently. I’m [name_f]English[/name_f] and have a very stereotypical [name_f]English[/name_f] accent for context
[name_f]Madelyn[/name_f] - with a LYNN sound at the end
[name_f]Madeline[/name_f] - with a LINE sound at the end
[name_f]Madeleine[/name_f] - with a LEHN sound at the end
[name_f]Madelyn[/name_f] and [name_f]Madeleine[/name_f] probably only sound subtly different to most. But I would say that these pronunciations get mixed between spellings so I wouldn’t be surprised if I met a [name_f]Madeleine[/name_f] who said [name_f]Madeline[/name_f] or a [name_f]Madeline[/name_f] who said [name_f]Madelyn[/name_f] if that makes sense.
[name_f]Madeleine[/name_f] is my favourite, then [name_f]Madeline[/name_f], then [name_f]Madelyn[/name_f]. I also really like [name_f]Maddalena[/name_f] which I think is the Italian version. I once spent a summer working on a farm in the mountains in [name_f]Italy[/name_f], and there was a family living their with a young baby daughter named [name_f]Maddalena[/name_f] and I thought it was beautiful