PTHREAD_MUTEX_INITIALIZER vs pthread_mutex_init ( &mutex, param)

Is there any difference between pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; **Or** pthread_mutex_t lock; pthread_mutex_init ( &lock, NULL); Am I safe enough if I use only the first method ? **NOTE:** My question mostly refers to very small programs where at the most what I'll do is connect several clients to a server and resolve their inquiries with worker threads.