Canon wise Ken now lives and train in america (San Francisco) and jump into tourneys wich are like vintage UFC but in a ring that are called generic "US Championship"
Wich are bit big deal in SF world as we know even who was previous Champion (Nash, who "died" back to SFA days)
So they westernized Ken even more (even if unlike most think Ken is'nt american, he's born-raised in Japan and only 25% american by mom side lol), for example they gave him standard boxing as basic punches
Give Ryu very "japanese" looking stuff giving him poses classic of Karate styles was i guess mostly to further differentiate them... like if Ken gone 10 steps left, you double that distance by moving Ryu 10 steps right
Ryu in that way appear the tradition guy, have some strikes that feel very "kata" next to some more scrappy Kyokushin looking stuff
The more traditional/clean stuff feels kinda shotokan looking to me, but tbh i'm not much a Karate guy myself (did boxing/kickboxing) so maybe it could have some different sub-style influence too
It's also likely current Ryu one is supposed to represent the classic style as was taught to them and he stick to it(aside occasional new stuff he develop himself), while Ken is more a "rebel" into adapt it to his needs/style and mix it with other stuff he likes
It's cool because at this point they basically incarnate Karate that stayed and evolved in Japan and Karate that went overseas and transformed itself by western "contamination"
Also Ryu favor defense with single heavy strikes/counters and Ken attack with fast combinations so it's bit fitting former became all about strong old school japan well planted positions, while latter instant loved dynamism of western light footwork
As the local fanatic of Cobra Kai show, you should LOVE the Ryu/Defense/Japan and Ken/Attack/Murica! thing, as at this point you have same shit of Daniel-Johnny lol
Except Ryu is supposed to be tougher and heavier puncher than Ken, while Ken is more the speed guy who loves kicks (plus is the one with lot money hot wife lol)