Good question...probably there wasn't any particular *engineering* difference.
I have the suspect that that HP HP X130 was the family name (with its related SKUs) of 10G SFP+ Transceivers adopted and supported by Comware based Switches like the one of FlexFabric, Altoline, Blade and FlexNetwork Switch series (see 12500, 10500, 5700 and so on)...while the HP X132 was, at about the same time, the family name (with its related SKUs) of 10G SFP+ Transceivers adopted and supported on some - not all - ProVision (now ArubaOS-Switch) based Switches like the 6600 (retired), 5400 zl, 8200 zl, Aruba 5400R zl2, 2920 and so on.
This difference looks quite clear if you look at HP FlexNetwork Portfolio Guide (2012, so historical!) in which both HP X132/X130 10G SFP+ Transceivers families were listed in the same Switches Support Matrix.
The same is actually true if you look at HP FlexNetwork Portfolio Guide (2016, so actual): this document has the same name (4AA1-4855ENW.pdf) but its publication date is very actual compared to the first one.
The X130 10G SFP+ LC Transceivers family had these SR, LR, LRM and ER models:
- (JD092B) HP X130 10G SFP+ LC SR Transceiver
- (JD094B) HP X130 10G SFP+ LC LR Transceiver
- (JD093B) HP X130 10G SFP+ LC LRM Transceiver
- (JG234A) HP X130 10G SFP+ LC ER 40 km Transceiver
The X132 10G SFP+ LC Transceivers family had these SR, LR, LRM and ER models:
- (J9150A) HP X132 10G SFP+ LC SR Transceiver
- (J9151A) HP X132 10G SFP+ LC LR Transceiver
- (J9152A) HP X132 10G SFP+ LC LRM Transceiver
- (J9153A) HP X132 10G SFP+ LC ER 40 km Transceiver
Technically I'm not able to say for sure they were (or weren't) really different at engineering level (for sure their SKUs were different)...but *I think* they simply weren't.
The HP X130 10G SFP+ Transceivers QuickSpecs seems really unobtanium.