VF35 and VF34 are both based on a vf30. VF35 has a smaller exhaust side improving spool but slightly dropping peak, VF34 hs a roller bearing core but retains same exhaust.
35 and 34 have pretty much same spool but vf34 tends to have 10bhp ish more peak, cos of its better peak tends to hold its value better second hand as well as being bigger cost from new