I did the measurement on the SMdF and posted about it in that thread, but it does differ by quite a bit.Don't forget, the amount of soap in RR containers is measured in ml, not g. I am not sure how close the soap is to 1g/ml, but it is worth thinking about.
250ml of SMdF relates to about 180g, so about 70% of the weight.
My others have been similar...120ml to 90g etc.