Hi We have previously been using two Hikvision DS-2CD2385G1-I 4K 8MP turret network camera with a Hikvision DS-7604NI-Q1/4P DVR, we were looking to put in another system only to find that we cant find the same units that we used a few months ago and we are struggling to find out the exact differences to what we think are the direct replacements are. Does anyone know the detail of the differences between the above and the following units Hikvision DS-2CD2386G2-IU 8MP turret network camera with a Hikvision DS-7604NI-K1/4P(B) and if the new units will give us a similar performance to the last units. We use these to remotely monitor machinery that is not attended at all times so the use is indoors with low levels of light when not attended and bright when attended. Appreciate any comments