Event Espresso 3 and Event Espresso 4 are significantly different. Your information will be migrated but any customizations to the template files will need to be manually updated.
No, currently EE4 does not have the exact same feature set as EE3.
Is there a specific functionality you use within EE3 that you would like to know is within EE4?
I think the best option would be to copy the site locally and install EE4 there so you can see if it will suit your needs before installing on the live site.
Personally I use the plugin Duplicator to copy sites locally, but there are multiple choices within the plugin directory.
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Support forum for Event Espresso 3 and Event Espresso 4.