If we need to find the images I'd say the best source is some sort of shopping site(I'm only so so at finding things). It's not a bad idea to put them side by side for comparison's sake but only if they happen to be very different in some way. I've just had a few anime VHS tapes where the covers were exactly the same as the DVDs so two of the same thing side by side is kinda boring.
Sorry for the late response. The user 0Kimiko0 seem to have a way to find DVD covers of the Blu-ray counterparts but now that user is gone I can't get the pictures I need for the home video releases list and marv.jp only shows the Blu-ray covers on there site. Do you have any the VHS sets of Futari wa Pretty Cure and Max Heart? If you do would you mind getting them get the front covers scan to replace the inferior ones in the two articles.