I dont think this one is less accurate,in fact contrary,I belive it is more accurate. Video gives a lot of insight,and with information published by defense ministry we can get some picture abt this missile. In my opinion,this missile is far more important than most people think. We have completly new propulision system,...new fuel with new engine...This gives missile only 12 minutes reaction time,and it can be stored for years fueled and ready to lunch. Also warhead itself is unique,with own propulision system ,and it can also perform mid course trajectory update out of athmosphere(demonstrated in this video) and it is capable to perform manuevering in terminal phase.
So,a lot of new stuff...this new fuel and propulision puts strategic missile with 1500 kg payload in to fast response/first strike capable missiles,reserved,till now only, for solid fueled missiles.
Till now,line of fast response/first strike capable missiles included all ,except one, tactical quasi-balistic missiles. Sejil and now Khorramshahr 4,are strategic balistic missiles ,but in same time can be kept in ready to lunch positions and dont require large crews for deployment maintaince,fueling...etc.