Should be fine. If you had a mixed flock or if they were much younger, I'd be hesitant to put them all on layer, but no reason to waste it.
If in the future you decide to just go with all flock all year round, that's an option too. I actually do a 50/50 split with grower and layer since I...
How old are they? If they're old enough that half the flock is laying, I might consider just having them all on layer since they're obviously pretty close to it.