Can somebody help me understand closing costs a little bit better?

My partner and I are looking to put an offer in on a house. My mom is helping us with a down payment so she has had some say in this process. I think I’m understanding closing costs but I’m having a hard time communicating that knowledge to her. My mom is wanting us to put a lower offer on the house and my real estate agent is suggesting we offer a slightly higher offer while asking the seller to cover closing costs. If we put in a 205k offer asking the seller to cover 5k in closing costs, it would be the same for us as if we put in a 200k offer right? Is there any reason why the 205k offer is more appealing to the seller? That’s what my agent is making it seem like but I’m not sure why.