MX-NAS-X-BAY to QNAP

Would you have the QNAP Model numbers as they relate to Mobotix NAS. (I understand that MX-NAS products are beefier than QNAP Standard hardware)
MX-NAS-2Bay
MX-NAS-4Bay
MX-NAS-8Bay

Thank you Kindly,

As far as i know MxNAS has only ram expanded. Codes should corelate like below
MX-NAS-2Bay → TS-251+ 8G
MX-NAS-4Bay → TS-451+ 8G
MX-NAS-8Bay → TS-873U-RP-8G