One difference is in the balance or proportions between the “Hey, it’s a holiday! Stores should have sales! Let’s go have a picnic!” aspect, and the comparatively somber commemorative and remembrance aspect — the “memorial” part.
From maggiethecartoonist we have this Real Life Adventures, which takes a focus on the holiday picnic (or rather, barbecue) aspect.
On the Remembrance side of things, another regular reader suggests this one:
… and provides a reminder that it has previously been the subject of a CIDU post and discussion.
Joe Heller seems drawn to combining the two aspects in one editorial-type cartoon: