I'd like to suggest they may be more complementary than strictly achieving the same, which seems like why most studies suggest trying to perform a mixture. Of course, something is better than nothing relative to your interest and limitations! (eg, arthritis, joint issues, preexisting conditions etc.)
Speaking only for myself, I definitely feel the best mentally and physically when balancing the two. And if I happen to take a break from both, boy, does my mental state nose-dive within 2 weeks.
Absolutely! I admittedly fell for this for many years as a runner, but these days I do just some light/moderate squats, leg extensions, curls, alongside sprints/inclines, etc. and it's made a big difference! Especially in stability.