Kansai One Pass vs ICOCA

I read that they are almost the same but KOP allows discounts on tourists sites.
Is that true?
Can I use KOP outside Kansai like the ICOCA?
Can I use it also in Tokyo for example like ICOCA?

If I stay 4 days in Kyoto, is it better to use KOP or buy a day pass for the city?
Which one is best suite tourists attractions places needs?

Works the same.

KOP is the same as normal ICOCA as functions and uses a special design.

Tourists sites discount tickets is not attached to normal ICOCA .
There is no fare discount for transpotations either.
It just does not have to bring a extra cash mainly coins.

ICOCA can not be used only for transportations.
https://www.westjr.co.jp/global/en/howto/ticket_03.html
https://www.westjr.co.jp/global/en/howto/guide/movie03.html
How to use ICOCA is the same as Suica(no sales in Kyoto and around).
http://www.jreast.co.jp/e/pass/suica.html
This video should be easier to understand including "re-charge" part,
bc I can not understand why the explanation about re-charge in ICOCA's video is missing.
Although it is missing that both videos can be used as cards in other areas like Suica in Tokyo and more.
https://en.wikipedia.org/wiki/ICOCA