I've never used a Pinter so far from an expert, but aren't they only a 10 pint capacity, whereas the Muntons kit is for 30 pints? If so, I don't think that is going to work unless you only use a third of the Muntons kit.
I have seen people on the forum use a Pinter to ferment beers not produced from the Pinter packs so I believe it can be done.
For your first attempt though it might be easier to use a Pinter pack so you can learn the ropes? Or have I misunderstood and this is your first time not using a Pinter pack?