Yes, they have a few things in common 1)being America 2) divorced 3)being females.
But Sparkles comes from a totally dysfunctional family, has NO breeding, manners, nor intelligence at all and doesn't know nor understand ANYTHING whatsoever about the UK; not its history, culture, table manners, protocol, etc. and refuses to learn anything other than finally managing learning how to curtsy in over 2 years.
Her intentions are the same: Show me the money, buy me the jewels, and let’s go party.
Of course Wallis had breeding, manners, culture, and exquisite taste that few people have today.
By comparison Megan is a train wreck. Harry is too.