Hello,
I tried to upgrade from RH7.3 to RH9. Everything worked fine, but the KDE exterior changed drastically. Everything looks different, not as it was in my installation I worked for about 2 years. I was very pleased with what I had and now I must start a long work of searching fonts, colors, settings, etc. to achive similarity to what I had in RH7.3!
This work looked so hard and unpleasant, that I returned my RH7.3. back!!! (I had backups) and now I feel like a stupid child...:-))
But after some thinking, I started to hesitate - may be I did something incorrect? It can not be so, that there is no compatibility at all between two sequential versions of KDE/X.
I shall be very obliged to those who can comment this somehow and suggest something...