To be honest, I can't say definitively, and it would be tricky to find out unless you know a currently serving officer who could look up the facts and figures for you. The pension system changed on 1 April and anyone joining after that date is on the new system.
In principle, if you are not certain how long you want your career to be, then if offered a PC, the best bet is to take it, because a PVR is likely to be honoured, even if it takes time, whereas the move from a SSC to a PC can never be certain, however good you are.
The pay is the same whether you are on a SCC or a PC, but I am not sure that the terminal benefits would be the same if you had served the same amount of time and completed your SSC versus PVR'ing from a PC. In approximate terms, retiring from a SSC gives you a small, immediate gratuity, not sure how much. PVR'ing from a PC would give you a preserved pension, payable from the age of 55 (if you had only done 6 years productive service this might be about 5kpa), but I am not sure if you would get a lump sum. For comparison, if you completed your PC and then left, you would get an immediately payable pension of about 12kpa and a gratuity of about 40k, and you pension would increase by inflation from the age of 55 - the best possible pension deal allowed under the previous govt legislation. In all probability, the difference between benefits of completing a SSC and PVRing from a PC would be negligible given your age and earning potential in your new career.
I can't think of any way that you would be 'worse off' than financially, unless you include issues such as taking a PC slot from someone who was totally committed to a full career - but that gets all rather nebulous.
Bottom line, take a PC if offered, it allows you control over both options, stay or go.