upgrade motherboard

(Let me preface this by saying I don't know much about computers) I'm going to be upgrading my prebuilt PC (Acer Predator G3-605) pretty soon. I'll be getting the AMD Ryzen 5 3600X CPU, so I'll need a new motherboard. Will the GIGABYTE B450M DS3H V2 motherboard fit in my current computer? Is it...

Hi there.. I have a dell inspiron 15 3542 with a core i3-4005u and no dedicated GPU. I found some motherboards for sale that are made for the same laptop model but with a core i5-4210u and a gt820m GPU for a pretty cheap price. so I wanted to ask is it possible to swap the motherboard I...