What you want is something easily and quickly digested ---> so yes, immediately after weight training drink/eat around 30-50 grams of simple carbs (dextrose, maltodextrin, whatever) combined with 15-20 grams of whey - REGARDLESS of the time of day you workout...even if you are cutting these few carbs, consumed immediately following intense training, will not hinder fat loss (nor will it promote it).
Just my two cents...