I like the top one better but don't take my word for it, I'm just going off of what I've seen as I've been looking for a Jim Carrey aswell.
The bottom one looks like his older signature but it's not as smooth as the top one but it helps you have an inscription, maybe you can find something authenticated to compare it to? Not too familiar with his handwriting outside of his signature, don't take my opinion as fact though.
Thanks Mike, I was thinking the same way as you. I was also thinking that the bottom one does look like an older style of his signature so I thought maybe that one was authentic lol
I don't know about the bottom one either, there were posts about Carrey on here before and the guy who gave his opinion was active yesterday. Best of luck!