As for real Don't read this info, use something more official
And don't beleve everything writtwen in the Jane's references.
Su-33 its a modification of Su27. It was called Su27K firstly (K means Korabelnuy "Ship-based") Since 1985 Both Su-27 & Su-27K(33) can carry free falling bombs, unguided rockets "NAR", And guided missels for Su33. Lomak got Su-27P version of aicraft (P-PVO/Perehvatchik (i dont remember) - Interseptor, it means it can carry only A-A guided wearpons)