I own lots of different species of wild bettas, and yes, their care is very different from what I give my splendens.
Most species except for some of the larger mouthbrooders, prefer very soft and acidic conditions, which can be accomodated through the use of peat moss, R/O water and Indian Almond Leaves. My tap water comes out of the tap very soft so I just add Prime and IAL extract during water changes.
While most species can live in groups, they will still fight on occasion, and so a lot of cover is needed in tanks where anything more than a male/female pair is housed. I use branches, leaf litter, moss and floating plants to provide cover for my wilds.
Some species such as unimaculata inhabit areas where there is a fair amount of water movement. However, others like my rutilans prefer a stagnant environment and don't need filtration.
Because of the soft water and acidic conditions most wilds prefer, cycling a tank is often difficult and unnecessary. Instead I do several partial (around 20%) water changes over the course of the week. This also prevents shocking the fish with sudden swings in parameters. Filters are only used to circulate water.
Wild caught species are often very shy, and some will remain that way, only ever coming out of cover to feed. However, hand-feeding your wilds and starting them off in smaller tanks, are both ways you can get them accustomed to you. Right now, my rutilan male is so comfortable in my presence, he doesn't even bother hiding while he's got a mouth full of eggs.
Feeding can be difficult. Some wilds will only accept live foods while some others will accept frozen too. None of mine will eat flake/pellets.
Also they will jump through any space no matter how small. I just lost my male unimaculata after he got out through my filter cord gap. They do best with a very tightly fitting lid.
While not as flashy as splendens, I much prefer my wilds. They tend to have less health issues overall, and are certainly more striking in their own way.