3bet sizing should not be the same. It should be dynamic, much like our range, adapting to conditions. 3betting x4 is usually going to be poor sizing, but if you have seen villain r/c at this size already, then it's fine.

You need to be careful that you're not turning your hand face up with your sizing. If you're making it x4 for value and x3 for bluff, well you're giving away a lot of information.