Then when they realise it was supposed to be the same person, they did there best to make Agnes look like young Lily?
That doesn’t make sense to me. Casting decisions for guest-star roles can be changed before filming actually starts. It happens all the time (e.g. recasting of Robin Hood). It might’ve meant disappointing Agnes Bruckner after originally getting the role, but actors deal with rejection all the time. It wasn’t too late to cast someone else of Latina heritage before filming began, because the casting call went out before filming ever began.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy