No, they are wired through the same flasher unless you wiring harness has been unnecessarily molested.
I had to run standard bulbs in the back even though I replaced the stock flasher on my bike with the LED flasher from superbrightleds.com .
When I attempted to run LEDS on the front and back it did not present enough of a load to trip the flashers.
That's OK because the rears are only used when I flip the turn signal so not a whole lot of wattage is wasted. The LEDS are in the front where they are used as running lights and turn signals so I can save a few watts.