Gohan and Gokus fighting style are very different though their teqniques are similar.
Gokus go to is the dodge and wait for the opening, Gohan on the other hand is more of a block counter and try to turn defense into offense while (as an adult at least) using less strikes but more powerful strikes to be able to go on the defensive on the fly when the situation calls. Gohan more or less sits in the pocket and plays jab range footsies fishing for counterhits. Goku being a dodge counter guy,
finds an opening goes on offensive till he gets blown up he’s always trying to put someone in the vortex or tod combo them. All in all its a stupid over simplification but.
Goku is like Ken, Gohan is like Ryu. Similar but not reallt if you know about nuances in fighting.