BMP280 Body marking unmatched with datasheet

[Carlento]

We have BMP280 in hand , while find the last letter of body marking is "L", but info from datasheet shows it should be "S" or "M", also different substrate design were found , please help us to identify this issue. 

Attached some info for reference, THAKNS A LOT

[BSTRobin]

Hello Carlento,

Could we know where and when you bought BMP280?

[Carlento]

Hi Robin, 

Thanks for quick response first.

Parts were bought from our local vendor, which is confidential info aganist our contract, therefore I can not provide as for now , 
please advise if you still can help us , thanks. 

Carl 

[BSTRobin]

Hello Carlento,

From your sensor marking, you part is BMP285 that is not in production.

[sebp]

Hi, I also noticed this.

I bought some BMP280 sensors from

https://www.reichelt.de/de/de/entwicklerboards-temperatur-und-drucksensor-bmp280-debo-bmp280-p266034...

with markings "KU" and "KP". Are these valid sensors from Bosch? What does U and P mean? Should one combine U and P sensors in a sensor array?