You really need to normalize those data points to make a meaningful comparison.
What is the average age of people in Italy? In HK?
Political considerations (Italy is in EU - can they just unilaterally close their borders?)
State of health care system prior to COVID-19? There's some anecdotal evidence that Italy's system in the affected areas was already under stress.
Etc.
A Tale of Two Outbreaks: Hong Kong & Italy
Here is 22 pages of data and news on Hong Kong
Here are 14 pages of data and news on Italy
If you want to research those variables, knock yourself out.