Not best, but you should be OK.
Paste spreads out under heat and pressure.
Not to worry.
The cpu will monitor temperatures and will slow down or shut off if it detects a dangerous level.
No doubt, you are anxious to try out your new cpu.
Go ahead.
Monitor your temperatures.
At idle, look for 10-15c. over ambient at idle.
If you see significantly more, plan on cleaning off the old paste and replacing it with new.
You can monitor temperatures with HWmonitor.
It will give you current and max per core temperatures.