The first one is pronounced with an O shape with the mouth (like you would do with the word oh), and the others with more of a smile shape (like with the word see). It’s impossible to pronounce one like the other.

I’m not a native English speaker and I gave up trying to pronounce th (father, through). Although I can hear the difference.

Arguably so is “aim/ein etc” and “in”, though more dialect dependent and more subtle.

The former for me have a bit more exhale and round sound while the “in” are a tad drier.

For example “fin” and “faim” are distinct for me. However “faim” and “feint”