I believe they're the same, as both require the external ignitor IIRC. Here's a note I made about splitfire part numbers;
1. SF-DIS-001 = All R32, 33GTR, Series1 33GTST (all external ignitor)
2. SF-DIS-005 = Series1.5 GTST(old body new motor), Series2 GTST, 34GTR (integrated ignitor)
3. SF-DIS-008 = Neo 34GTT