as a general rule.
You can splatter stuff straight over the top.
Evidence? I always have and nothing ever died.
The uninstallers work for older versions. I have used them to this end before.
In actual answer to your question: I would in that position either do nothing with the JB (what works works) Just splatter over the updated font thing. Then test that. if that works then great.
then if I was feeling like I really really wanted a higher number on my JB thingy I would remove it and run the newer installer.
DISCLAIMER: Tbh your question has been asked in various guises throughout this thread over and over again. I am simply dredging from memory the answers I read.
Maybe a "UPDATING FROM OLDER VERSIONS!!!!" and "DO I NEED TO REMOVE THE PREVIOUS VERSION???" big bold FAQ would be in order Niluje in the top posts?
No I mean really big
Oh and If I got the answer wrong? heheh even more need for the HUGE FAQ