The 2008 turn signals are married to the brake light bulbs, so you definitely need another solution.
The 2011 are only amber per the bulb tint, but it is separate. Having said that, the swap can work... it would take a bit of work in rewiring things at the pigtails. You would have to split the 3 wires going into the old pigtail into 4 wires for the new separate bulb configuration.