Our landing crosswind limit is the same for 737s with winglets and those without (40kts on dry and wet). Take off crosswind limit however is different as the NG with winglets is only demonstrated to 34kts and in my company that is now a fixed limit including any gusts whereas aircraft without limit have a take off crosswind limit of 36kts. So there is a difference of 2kts for take off, none for landing in my outfit.