Yes, if everything else is the same, they would get the same AE if you take provinces in Africa as if you take provinces in iberia. But religion is very important. If Kilwa is sunni, you generate 50% more AE with sunni countries, but countries of other religious groups will get -50% AE (so 1/3 if there are no culture/HRE modifiers)So Castille will become as mad about me taking their African territories as they would if I had taken land in Iberia proper (ignoring religion modifiers)?
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