Is it safe to use my charger adaptor

I have Asus ROG G73SW model. Wondering if it safe to use my charger since the black plastic that was once on the adaptor tip of my charger melted inside my DC jack. So wanted to know it be still ok to use and wanted to know since I'm gonna replace my motherboard on laptop soon and dont want to short/fry the motherboard. Is it ok to use other adaptor tips to replace the old one I have? 1st picture show how the tip doesn't have the black plastic on it. 2nd picture shows another charger adaptor tip I have laying around if I should cut that one off and put it on my charger? Hope the pictures helps.