Thing with the numerous op8 conversion charts I find is the different ways to administer one drug can effect the score of another. Say for example I was looking for X IV (The only method shown,) tried to compare it to something I used that way but couldn't find anything, so looked for IV to oral and the dosage looked completely wroong think it was 10/15 ml x compared to 200mg Y oral. It may have been right. BUt it would be a risk trying it out..
Plus i've seen other contradictions on difference sites. Are they reall accurate,, or a rough guide line with large margins for error?