The comparison is valid. Both belong to the same age group. Vicky is 30, Kartik is 28. Both of them started their careers at the same time. Kartik debuted with the successful sleeper hit Pyaar Ka Punchnama in 2011, Vicky got his break in the form of Masaan in 2015 and both of them have almost the same number of movies under their credit. While Vicky was in around 10 films and 2 short Netflix movies, Kartik starred in 7 movies and 1 short film.