It really depends on which series you're talking about, and the time they were produced in, given how authors approach their works.
The difference between something like Hajime no Ippo and Ashita no Joe is equal to the difference between Tiger Mask and Kinnikuman I'd say.
As for the differences between wrestling vs boxing anime, the wrestling in Tiger Mask is treated like it's the real deal. Tiger's Den's assassins masking as wrestlers were sent to literally kill Tiger Mask in the original show, when we all know that professional wrestling is staged and the outcome, predetermined.
It really depends on which series you're talking about, and the time they were produced in, given how authors approach their works.
The difference between something like Hajime no Ippo and Ashita no Joe is equal to the difference between Tiger Mask and Kinnikuman I'd say.
As for the differences between wrestling vs boxing anime, the wrestling in Tiger Mask is treated like it's the real deal. Tiger's Den's assassins masking as wrestlers were sent to literally kill Tiger Mask in the original show, when we all know that professional wrestling is staged and the outcome, predetermined.