Repair of an HP82004A Power Reserve Pack

[albertofenini]

I'm confused ...
If I look at the schematic provided by AndiGer the transistor 094 is replaced with a 2N3904
If I look at old posts or the Jaques Laporte documentation the 094 is replaced with a PN3646
Which one is correct ? Or both are possible replacement ?
On Wikipedia a suggestion for replacing the 2N3904 is the BC548, does anone has ever tried this ?

take care !