Fact: Motorola purposely maintained backward compatibility with 68000 according to their spec.
Experience: All 68000 software (I have tried) works fine under 68020.
As has been explained to you, this is simply not the case. That you've not used any software that is that calls on a 68000 specific function not available in later models does not change this.
People offer upgrade 68020 boards for Amiga so it's not based on some inductive knowledge.
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The experience by itself doesn't allow you draw a general conclusion for everything just like running a few titles on emulator does not prove emulator is same as real amiga.
