probably pretty close, but preference may make as much as a 7-10 day difference or more...
half the pistils are showing color and retracting...
3 good observations to help guide youself to a consistently timed harvest, relative to development.
1 pistil coloration
2 density
3 trichome coloration 10 to 70 % amber? i bet some go longer than that... i prefer an earlier harvest based on the buzz. google, read up on some opinions, but definitely figure it out what you prefer through eperimentation.
you can easily observe an early -to- late harvest in a consistent way for better comparison to figure out what you prefer... more amber? less amber? etc. Trichomes are probably the best of the three, but sometimes they are a bit odd on some plants. i've heard some don't turn amber no matter how long you wait. The other physical traits will help when the trichomes don't jive with overall development of plant... don't want it rotting on the stem, either.