Meaning is the same, but grammar is different!
☆この is like adjective. Noun always follows after that.
For example, このくつ=this shoes, この人(ひと)=this guy
☆これ is like noun, which can be subject or object
1. subject
これはりんごです。(This is an apple.)
2. object
私(わたし)はこれがすきです。(I like this.)