Just a little example..
Today I saw a scene in ghum where Savi asks Rajat to come to the elocution competition on time to which Rajat responds rudely. But this same scene played out very differently in yhm..In yhm, it was a comedy scene with Raman and Ishita bickering.
So yes eventhough it is copy paste, ghum writers aren't able to execute it properly. Or may be this is something which is intentional. In yhm by this phase, there was a sense of ease between both Raman and Ishita..they had this "constant bickering and annoying each other" kinda dynamic which isn't there in ghum.
This is what happens when makers drag the show for a long time. With the time, the show loses its charm and TRP stays stagnant or decreases. All shows between 2.0-2.3 are lucky cuz overall viewership has gone down in SP. They seem to be okay with it. Now 1.7 is best for Rangu. This will further go down in the future as TV will become less important for new TRP audience. I think they shoukd consider producing finite shows now.
...It was ko colours ...I think ..I never used to watch " Sithara shows "...First try on Sithara was Ghum1 here I am still suffering 
1k