Do you guys think people would notice when you raise 3x to 3.5 x from UTG as opposed to 2.5 from Late position?
Yep, they notice, it is sensible to discourage opponents from playing against you where they have position using a larger raise size. They know that if they call big bet under the gun that they will have position but will be up against a stronger range. Small bet from late position means a much wider range, but they must be prepared to play post flop out of position.
That is all the information they can notice.