What's the difference between the swedish and swedish - pro keyboard layouts?

There seem to be two layouts for Swedish (not counting Sami) and I don't understand the difference.

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Solution 1:

As far as I can tell the only difference is that @ and ™ has switched places on the two layouts.

Swedish vs Swedish Pro keyboard layouts on Mac OS Screenshots from MacOS High Sierra (10.13.4)

Solution 2:

On Macintosh computers, the Swedish and Swedish Pro keyboards differ as regards the characters available using the ⇧ Shift or ⌥ Option keys. ⇧ Shift+§ (on the upper row) produces the ° sign, and ⇧ Shift+4 produces the € sign. The digit keys produce ©@£$∞§|[]≈ with ⌥ Option and ¡”¥¢‰¶{}≠ with ⌥ Option+⇧ Shift.