1)The regulation on COVID-19 is very strict in Country A beyond comparison with that in Country B.
2)The regulation on COVID-19 is very strict in Country A that could not compare to that in Country B.
Does these sound natural? Which one is more natural? 用 英語 (美國) 要怎麼說？

查看翻譯

They're both very close!

For 1) it would sound better as two sentences.
"The regulation on COVID-19 is very strict in Country A. It is beyond comparison with that in Country B."

For 2) it would sound better if you replaced a few words.
"The regulation on COVID-19 is so strict in Country A that it could not compare to that in Country B." or
"The regulation on COVID-19 is very strict in Country A and can't be compared to that in Country B." or
"The regulation on COVID-19 is so strict in Country A that it can't be compared to that in Country B."