While I don't disagree that there are some similarities between those two Arcs, I respectfully disagree that they are all that similar. Doflamingo and Crocodile both creating civil wars while taking over Kingdoms isn't much different than there being a lot of wars for Kingdoms in Kingdom, Game Of Thrones, Magi, etc.. If that makes The Dressrosa Arc repetitive because of The Alabasta Arc, then those series would have to be called repetitive since those themes are in virtually every Arc of those series. One Piece, like those Universes, is simply a Universe that naturally has a lot of Kingdoms. There are a lot of Islands, thus there are naturally a lot of Kingdoms, and when you have a lot of Kingdoms there are going to be a lot of civil wars. There are also some differences between Doflamingo and Crocodile. Dressrosa was The Donquixote Family's Kingdom to begin with, so Doflamingo was just taking his Family's Kingdom back, and did so forcefully. Crocodile was taking over a random Kingdom and was doing it for a different reason, to find one of the Legendary Secret Weapons.
I do agree that Miss Valentine and Machvise have similar Devil Fruit abilities but I don't entirely agree with the other examples. The only similarity between Mr. 5's and Gladius' Devil Fruit abilities is that they can cause explosions, but the mechanics of the abilities are completely different. Mr. 5 can simply turn his boogers into bombs and Gladius can implode things. They're not any more similar than a nuke is to a cannon ball. Miss Goldenweek's and Jora's Devil Fruit abilities are somewhat similar but only in that they're both art related. How their Devil Fruit abilities work though is completely different. Mr. 1's and Baby 5's Devil Fruit abilities are only similar in the sense that one of the many weapons that Baby 5 has to choose from, she can choose a blade. Mr. 1's Devil Fruit abilities are more similar to Jozu's IMO than they are to Baby 5's because they're mostly the same concept, with one of the only differences being that Mr. 1 is steel and Jozu is diamond. Baby 5's Devil Fruit abilities are weapon based in general.
Outside of basic themes that you would find in any series with a lot of Kingdoms, there are few if any similarities between Dressrosa and Alabasta, and there are far more differences between them. So I wouldn't go so far as to suggest that The Dressrosa Arc is repetitive of The Alabasta Arc.