compression test question

[The Loves]

I know the Bentley says to do a compression test with warm oil, all plugs
removed, coil disconnected and throttle open.
The car had been sitting for a few days and I did it stone cold (70 deg.
outside).
What difference would you expect to see in compression, warm vs cold?
Higher or lower when warmed?
140/150/150/145/145 stone cold, 270k and head has never been off the car.

TIA as always