Key coding

[R1maS]

The "MS" keys...the only way that I know to tell is the FCC ID printed on the keys, inside the case, under the key blade on the normal fob, and on the fob shell of the buttonless "sport key". Older keys FCCID is YGOHUF8423, the Motion Sensor keys are YGOHUF8423MS. 

I don't know about the origins of Aliexpress keys, but I would look for that, or the brand and model number is in the FCCID, HUF 8432 or HUF 8432MS.

I found little bit more explanation on Polestar forum HERE.
BUT! There is also information that the MS key does not help to avoid remote scanning