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In my experience that's a false equivalency.
I worked hard as hell to do a one armed pull up and I finally got it on my right arm, pretty close on the left. And my weighted pullups didn't improve tremendously. I weighed 170lbs at that point and my weighted pullups stalled at 85lbs for a set of 5-6. Good amount of technique involved too.
Right, point being it's impressive even if you're under 200lbsNah - it's harder than just a +bodyweight chin-up as you also have to factor in the way your body will naturally try to twist against the movement. I believe any unilateral movement is usually estimated as being more difficult than simply halving the weight of the same movement with both limbs as well.
(EDIT: this is in the case that you aren't specifically training for a one-armed chin-up consistently, more just doing it sporadically - training it as a specific movement is different to just "being strong enough" to do it)