I had some cypionate from a supplier and some of the batches were alot clearer than the others. Like you said some had a yellow tint and some were pretty clear. They both worked awesome! Color dosen't necessarily mean that it's real or not. Some labs use different oils and that will make a big difference. Also the purity of the raw materials.
I have seen some tren that was almost rust colored and others that were quite a bit lighter and they both worked well.