About few days ago I tried vintage modfied 70s squire jazz bass ,it felt uncomfortable Actually my fingers didn't touch strings well ,I don't know how to explain it ,best way is to describe is that the neck was like a circle with curve . I tried fender mm jazz bass and same thing happened and I didn't like it . Today one of my friend came to my place for practicing and he has squier contemporary jazz bass and crazily it was not same ,it felt much near like my Ibanez easy to play and I didn't miss notes like when I play normal fenders . On paper both have exact number of nut width and same body size and even pickup placement but I don't know why it felt much easier to play ?!any idea?
The contemporary jazz bass has a 12" fretboard radius, meaning the fretboard is fairly flat. The 70s bass has a 9.5" radius (more curved). I'd guess that's the difference you're feeling.
Neck profiles can be different. Neck fingerboard radius can be different. The setup on each can be different. To me, they are not so different that they become unplayable. It sounds like you're quite used to your Ibanez and have trouble adapting to other necks.