Heroin vs Fentanyl withdrawl

Hey all,

So I was luckily able to find some pure heroin no fent cut. I used if because once I left rehab my meds lapsed about a week and a half and I couldn’t get my subs so I was dying. I am preparing to stop so I can transfer back to subs again. It’s only been about a week so I don’t expect to much trouble but it’s not gonna be great either. What are the main differences between heroin and fent withdrawl? I’m used to just fent w/d and I’m hoping I can take my sub sooner with heroin than I could with fent. I’m scared to death and any recommendations are appreciated. Also I should be able to use 7-oh during that 24 hour wait period and take my sub right after, correct? Thanks again.