Well if both are incredibly bad kissers then I guess they could be compatible... I've experienced lots of incredibly bad kissers and few good ones. Luckily the guy of my first make out session was a really good kisser so I got a hang of the good kiss on the first go. Unfortunately after that I had to go through a bunch of bad kissers. They said I was amazing but I didn't know what to say back because they were absolutely shit. 😂
Once I did also make out with a girl who I wasn't compatible with, she said liked more of the freakishly deep tongue stuff, while I like the soft kisses. My best friend who made out with her once as well said she didn't like the way she made out either and preferred soft kisses like myself.
Being a bad kisser could just be to lack of experience or lack of technique and not lack of compatibility. Likewise you can be a great kisser but yet there can be a lack of compatibility or it could something else, you know sometimes you both just need to get on the same page with how you like doing it, among other things.
I mean if you are bad that's nothing that can't be fixed with proper communication and practice and kind of getting the groove of how you both are. I mean if I was bad to someone I'd want to know so I could fix it and get better.
On the other hand you know sometimes that compatibility, spark, connection whatever just isn't there. Sometimes you have to give it time other times it'll never come.
I once made out with this girl, who didn't understand kissing. I tried explaining it to her so many times. She kept letting her teeth knock into my tong and her gums kept hitting mine. It was terrible. It would be like pretty average one second and then BAM! out of nowhere her gums!
I think some couples take more time to get good at it, but I don't think you can be incompatible with one another at kissing. It's definitely something that can get better with practice/talking about it