ANSI vs ISO, there's qwerty ISO as well. There was a bigger enter key on older ANSI keyboards as well, they just shrank it at some point. Or so I thought. The backwards L key I had in mind is apparently a mix of the two. I just associate it with older keyboards.

https://superuser.com/a/1368499

Personally I use a Pinky4 keyboard where every key is 1U these days, even space and enter.