Yes, PCF could be imported in latest OnPrem, as long as the solution file, its solution.xml says it's compatible with 'OnPrem', not 'CRMLive'
There are some cases that's not be able to be imported, but they are not related with PCF
1) If you export from an Online org, then import it to OnPrem
2) If you export from an OnPrem org, then import it to Online
3) If you export from latest version, then import it on an old version
For above cases, under some scenarios, the import will fail, but they are not related with PCF. The import failure are not blocked by PCF