Although it's hard to tell, if pushed I would say you are slightly leaner in the second pic... but it's hardly night and day as mentioned, due to the lighting, hair etc. You've certainly done well coming from the 223 pic though.
TBH though, in 6-weeks, if your routine and especially diet is on point, your loss of a 1lb/week is about right... 1-2lb is considered healthy. I'd stop thinking the SNS stuff is making that much difference though, because it isn't... the average loss you've seen is going to be down to your diet and routine. Supps don't make that much difference, and even if you hadn't been taking that stuff you'd still be able to lose the same or more with a well controlled diet and training programme. Your loss is average, not a miracle thanks to the wonders of supplements. That said, I have found myself in the past that the placebo effect can be very powerful... it's a medical fact that it can make a difference for sure. No harm in continuing what you're doing, but your nutrition is and always will be the key, not a pill or powder.
You'll never know your true BF% without a Dexa scan, as you could be hiding visceral fat around your organs, but assuming you're not, based on your pictures there, you're somewhere north of 15% I'd say.
Ignore your friends (especially those who come across jealous and/or are in worse shape than you)... do what feels right for you and what makes you happy.
