The lower value resistor doubles the current so the life of the battery will be half.
A little 9V battery doesn't have much capacity for lighting LEDs continuously. You would almost see the LEDs dimming as the battery voltage runs down.
Have you ever seen the six tiny, skinny, expensive AAAA cells inside a little 9V battery? Four AA cells are cheaper and will last a lot longer.
You must keep the blue LEDs separate (not in series), each one with its own current-limiting resistor. Since 4 AA cells have a much greater capacity then the LED current can be increased to be brighter. A 100 ohm current-limiting resistor will supply each LED about 27mA when the four AA battery cells are new and they will last a lot longer than an expensive little 9V battery. :lol: