Interesting question...a particular to note is that three new SKUs were added on HPE 5900 QuickSpecs during 2017 under the umbrella of "Data Center" 10G SFP+ transceivers...respectively for SR, LRM and LR range (SKUs added: JL437A, JL438A and JL439A)...so it looks like a very recent addition.
Maybe a partial answer could be found reading this related thread...maybe the difference could be found in a different programmed EEPROM more than on a different electronic/internal hardware WRT non Data Center transceivers we are used to.