Different between 6364 and 6374

hi, I wanted to buy on hobby king a sk3 turnigy 6374 190kv but the finished europae warehouse and I do not want to pay for shipment from hong kong. I have seen that there is a 6364 190 kv with similar characteristics, so it changes from the two?

64’s and 55’s tend to have similar stator sizes, 74’s have longer stators thus more power

so it’s best to wait and take the 6374