Pem certificate error

Hi Blynkers, i try to made my blynk server on raspberry.
Now it work but i can’t use server.pem file (created with password and usend the same in server.ssl.key.pass=password line in server.properties file.
I have to take out server.ssl.key.pass=password line and use server.ssl.key=./server.key.
Use this certificate server.key instead server.pem is so dangerous ?
I have another one question: There is a way to transfer my projects created with your server Blynk, on this my home Blynk server?
Thanks in advance
Antonio