It's not always an apple to apple comparison because many stat boards don't use the A/B/C gradings. For example, HDB and LTA use numerical grades that range from 1-8. But by and large what I've heard is it's more or less the same number of months as MX scheme.

You note I say same number of months and not same amount/quantum because some stat boards base pay is 20-30% higher than MX, and hence same number of months x higher base = higher amount/quantum.