在Django信号中，这两个代码有什么不同？

from django.dispatch import receiver
from django.db.models.signals import post_save

@receiver(post_save, sender=MyModel)
def my_signal(sender, instance, created, **kwargs):
    # 处理逻辑

from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=MyModel)
def my_signal(sender, instance, created, **kwargs):
    # 处理逻辑