I will be very practical in my answer. DHT has a higher binding affinity for the AR than DHN. However, as I have experimented with almost every anabolic money can buy, I can tell you without question they have different mental and physical effects (person-specific I should add). DHT and DHT-derivatives will typically make you ‘harder’ and more aggressive. Nandrolone will typically make you ‘watery’ and less ‘hardened’ looking. The same aggression and sheer ‘manly’ feeling that you get from DHT and DHT-derivatives typically is not there with DHN.
The benefits you briefly refer to from DHT sound subjective (mental). In my experience, I have tried the hypothesis that adding a DHT-derivative to Test and Deca will negate negative side effects from DHN (in this case the potential mental side effects of depression and lethargy that I get). The results turned out to simply be a blunting effect of both the DHT-derivative and nandrolone. It didn’t fully reduce the depression and lethargy from nandrolone, and the DHT derivative was blunted it is overall effect on my body composition and mental well-being. Bear in mind as you read this, I am not referring to steroid abuse or supraphysiological cycling for excessive hypertrophy. I am speaking only in terms ask dosages acceptable and used in TRT (e.g. 150 test, 75 nandrolone, 25 mg Proviron 3 x weekly).
DHN and DHT will compete for the androgen receptor. There will likely be a blunting effect of both wherein neither is able to fully express itself in terms of mental subjective benefits or physical benefits.
If you are that curious then do a small experiment where you add the scrotal cream with your nandrolone, document the result in comparison to your goals. Then, take nandrolone out while keeping the scrotal cream in and document those results in relation to your goal response.
At the end of the day any of us,
@Cataceous @Gman86, or myself can post studies about the relative binding affinities of DHT versus DHN, speculate the role of estrogen receptors, androgen receptors, SHBG and the like, hypothesize what creates subjective benefits of DHT or DHN and what would result from their combination, so on and so forth. At the end of the day, there isn’t enough information out there to come up with a sound hypothesis. Just try it, see how it goes. For me, it didn’t do nearly as well combining DHT and DHN as it did just using T and scrotal cream or a DHT derivative with T. For you, you may perceive different subjective results. Try it.