But there is no viewing requirement to lump it all together and ignore all (re)casting if you can find fun in-universe ways of explaining it, otherwise we wouldn’t have regeneration on Doctor Who. You leave it be out of necessity, if the alternative would be so ridiculous as to stretch fictional reality to the breaking point.
Yes, Spock immediately recognizes Kirk and Scotty, but he may already have been prepared to accept that they would physically look different even if he could “sense their personalities” (perhaps with the aid of telepathy) having known them so well. Is Chekov Kelvin supposed to look exactly like Koenig’s at seventeen, despite the fact that Chekov Prime is four years younger for some mysterious reason? Is Greenwood’s Pike supposed to look like Hunter’s, but with premature aging in that universe? I wouldn’t be so sure.
I can’t think of anything for Noonian Soong’s ancestors and descendants, but Sela could’ve been altered to look like Tasha just to distract Picard and his crew. There is no pressing reason to insist on it, of course, but the possibility does present itself.