The LC compatibility issue is related to later LCs. When the LCIII came out, an LCIII PDS was introduced with extra pins. However, the LCIII and later models with the LCIII PDS can use original LC/LCII cards.

The SE/30 PDS is unique and works only on the SE/30.

For the record, a list of PDS types:

-SE/SE SuperDrive (works only in these models)

-SE/30 (works only in this model)

-IIsi (works only in this model; IIsi PDS can be adapted to accept NuBus)

-Classic II (works only in this model; does not allow for external connectivity and usually used for 68882 card)

-LC/LCII (works in any LC series machine including Performa variants and the Color Classic)

-LCIII and later (works only in LC series machines with this style of PDS)