I have two DC, aged 6 and 2.5. If you ask 6 yo what he’s done that day (or eaten or whatever) he says he doesn’t remember and it’s hard to get him to recall it. One day at school they even had an animal handler from the local children’s zoo (brought in snakes and the like) annd he didn’t mention anything when I asked him about his day. Otherwise he has an excellent memory for facts, details, etc.
On the other hand, 2.5 yo will easily recal events of the day and what she’s eaten. For example, if I am talking to my husband and say something like “we ate at the museum,” she will say “I ate a croissant with jam and an orange and had apple juice with a straw,” even if the museum was 1-2 days ago. Or she says she’s played cars with Georgie, Carys, and Olivia at nursery, they had pesto pasta, and did sand play after their nap. Are they both just in a range of normal? It’s so funny to me that they are so different.