Lambda air calibration

[otto69]

Hi
I've just replace both of the lambda sensors (P/N 57006 Bosch LSU 4.9) and thought I would check the air calibration against the engraved cal # before using them for interest sake.
The air cal # is much higher than the engraved # on both, is this normal ??
#1 engraved cal 878, air cal 923
#2 engraved cal 831, air cal 873
Both were nowhere near fuel or exhaust at the time.

Clayton