Yes, Jelfa changed the compound to resemble Sustanon. However, there is one difference between the two. The first three testosterone esters are exact but the last testosterone ester in Omnadren is caproate while Sustanon uses decanoate. This is the only difference between the two. That said, there is a distinct difference between the two. Omnadren is faster acting and causes more water retention than Sustanon.
I asked the same question in another thread just a week ago, and Division responded to me with the above reply. I was a little fuzzy on it myself until he explained it, I hope that helps.