The similarities are:
The consistency of the liquid itself and its colour. They both look like milk and are very liquid.
The smell is also the same, except the OMI is stronger. I can’t tell you what they smell like exactly because there is no way to describe it, but none of those fruity and lovely smells. My nose handled it very well.
Both have alcohol. Since the OMI has a stronger smell the alcohol is also more noticeable. I don’t know the percentage, but my skin made no reaction to it either.