The first photo is middle of April so just coming out of winter colors, second photo is end of June (warmer weather and more sun). Plus it is a little stressed because of so many offsets, so the red is more intense.
Production of offsets depends on variety and growing conditions. Some may start production very early, like late winter, some hold the tiny babies tucked up under the leaves of the main rosette until drier and warmer spring weather arrives. I also think daylight hours plays a big part in the start of production.
Purdy's Big Red kept producing all summer and into fall. I removed almost all of the offsets thinking it would let the rosette recover. Instead she just started putting out another crop.
Some varieties may just put out offsets once for the year and no more until next year.
I really need to start keeping records of which ones do what.
I can say that Purdy's Big Red is my highest producing semp
and Gruenrand is my lowest with 2 offsets for the season.