No. This is because the LTE is a compund movement which utilizes a lot of muscles, including the deltoids and the pectorals, whereas skullcrushers are isolation exercises.
Because the work is distributed among so many muscles in the LTE (and because it's usually done heavier), it's harder to get the pump and contraction on the triceps you'd want to get the sarcoplasmic hypertrophy you need for teh Swoleness. That's why you'll rarely see people do LTEs at a comercial gym: people want a pump; they don't want to get stronger.
Skullcrushers make it easier to focus on the proximal heads of the triceps, ideal for maximum contraction even with lower weights.
It's like the difference between chinups and biceps curls. Chinups are an awesome upper body exercise, and a great strength builder, but they are not as effective in pure biceps contraction and pump like curls are, because the work is distributed among so many muscles and also your lats will probably fail before your biceps do. There are guys at my gym who couln't do more than 2 or 3 chinups, but have huge, very defined bulging biceps. I, on the other hand, can do sets of 15 chinups at 220lb body weight but my arms look like noodles.
