Friends invited people we aren’t close with to engagement party

How many extra people are we talking? If it was me, I would find a way to invite them to the wedding. This falls back on your FH since he left that responsibility to someone else when he was the one hosting the event. He's the one that's going to look bad when the engagement party guests aren't invited to the wedding. There's no polite way to explain to them that he couldn't be bothered with inviting people to the engagement party and that you don't want them at the wedding.

I personally wouldn't worry much about this, since his friends and brother were the ones who invited them!

Since they are throwing the party, dont worry about who they invited, it shouldn't dictate you wedding guest list.

You do not have to invite anyone who was at the engagement party to your actual wedding.

I'm of the opinion that people invited to the engagement party dont have to be invited to the wedding. I think a lot of times those are thrown so far in advance of the wedding that there arent usually many wedding details hammered out. If that makes sense.
Plus you and FH didnt invite them personally to it so I don't see that as an obligation to be invited.

In general, I'd agree that anyone invited to any pre-wedding events should be invited to the wedding, but in this case I really think it is okay to not invite them. Neither you or your fiancé invited them, and you are having a small wedding. In retrospect, your fiancé probably should have asked the party hosts who they were thinking of inviting to avoid this altogether, but oh well.

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I agree with this. You didn't make the guest list for the party so you are not obligated to invite them to the wedding.

Thanks for all the feedback and advice! Super helpful and reassuring