I don't think you need to adjust the amount if you don't see any *immediate* adverse effect. If you absolutely need the same solution strength, then you have to know which forms of sodium citrate you were using before, and you are using right now. Sodium citrate has many forms and hydration states... If you had provided this information, calculating the equivalent amount would have been very easy. (Most probably all are the tri-sodium citrate form - but at which hydration states?)
P.S. Most probably your current solution strength is slightly greater than the solution strength you were using with the crystalline form... Therefore, I think there's nothing to worry about.