Serial Number Lookup for 2 x Komatsu D375-5 and a CAT D8R

Hello everyone. Hope you had a merry Christmas.

Looking to purchase the above-mentioned pieces and was hoping someone could help me verify the year of manufacture as equipmentwatch and ironrecord do not go as far in terms of year of manufacture.

1) Komatsu D375-5, KMT0D050P02019467

2) Komatsu D375-5, KMT0D050C02019392

3) D8R - CAT00D8RA9EM05758

Thanks in advance.

Serial Number Lookup for 2 x Komatsu D375-5 and a CAT D8R