I honestly think GM started the change halfway through the model year. 94 literature doesn't mention an update but 95 stuff does, I've always believed it was 95+ but others are adamant it's 94+...
Could be... I don't know if I've ever seen a '94 with the older style grille though. Not saying they don't exist, I've just never seen one. And all the corner light listings I've encountered for my trucks are listed as '94+.