Backhoe Quick Attach, multiple versions?

[avc8130]

Has Kubota used multiple versions of the backhoe quick attach over the past few years? My buddy had an L39. He sold it recently and picked up an L45. He CLAIMS the buckets he had for his L39 quick attach won't fit the quick attach that came on the new L45.

Any ideas other than he is clearly delusional?
ac