Colorize diff side-by-side output and put label header on diff

I am writing a bash script to compare 2 folders.

The script will collect some user information (folders and files to compare) and afterwards loop through an array to show differences.

Something like:

caseNames = ("Path1" "Path2")

elementsToCompare= ("FolderA" "FolderB" "fileA" "fileB")


for i in ${elementsToCompare[@]}; do
    diff -r "${caseNames[0]}""/"$i "${caseNames[1]}""/"$i| colordiff | less -R

done

Now, I would like to show a side-by-side comparison between the files. The switch -y exists in diff to make this but it will not colorize the output. Is there any way to do this?

Additionally, the side-by-side comparison shows the full document, is it possible do restrict this to n lines above and bellow the difference?

Finally, I would like to tell the user what file is being examined. Sometimes diff puts a header like :

diff -r  Path1/FolderA/foo Path2/olderA/foo

Other times it will just show the file differences (I have experienced this with plain text files) without me knowing which file is being compared. Is it possible to put a header to show the user the files under comparison?

Best Regards!