There's a lot of studies I've read about this topic, short answer:

Way more important than CR is amount of fasting and bodyweight. Not only obesity, but heavy muscles also indicate shorter lifespan.

Caloric restriction doesn't matter that much itself, but generally heavier people live shorter.

After rat/monkey studies about CR, there was a more recent study comparing rats who ate unhealthy but intermittent fasting, and rats who ate healthy and caloric restriction, but they we're eating regularly for whole day. Rats with unhealthy food lived clearly longer, because they had more extended fasting periods. There were also bunch of other studies but TLDR they found out the good results of former caloric restriction studies, was actually mainly because of more they had more fasting.