All I did was add a different highlight color around the target selected. There's 4 colors: Red, Blue, Green, and Gold. If you want a different color, lemme know. (Also I didn't actually test them, so if they seem slightly off, do let me know ASAP)
Blue will be the most obvious. And yea, I figured it would Exp, but YOU did ask for it lol.
The game's ui.dat file has the same assignment for target selected hp bar as it does for self hp bar. Nothing I can do about that without hacks. (De-encrypting their files which is against ToS and I don't want another ban lol)