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It is essentially the same app. Comixology is sort of the standard when it comes to apps so DC, marvel, etc will use the Comixology software and do an app on it with just their books. If using android then you should see comixology right under DC and if Apple then in description you tend to see it say "powered by comixology".
Using these Android apps to buy your comics
If you're on Android or iOS you can get the DC comics app and Marvel comics app, or if you feel like combining them together the ComiXology app(links to playstore for Android, iOs you're on you're own). It's how I read all my comics.
I get having to drive far for a comic shop and I know not everyone has the privilege of being able to drop 60/month on comics. (For the record I only can because I don't pay for Spotify, Netflix, HBO, Hulu or Amazon prime)
If you want up to date comics then just download the DC comics app (Apple, Android). You can get all comics the same day they publish hardcopies. Yes you have to pay for each one but again, I don't expect DC to cannibalize their main business.
Edited to include links