If they are sampled instruments, then you should be using the EXS24 sampler. If it is Vengeance, look for a premade .exs file that already has the samples mapped out.
If there is not already an .exs file for each sampled instrument, then you'll need to load each sample manually, which is a more complex process. In order to do that, you 'll need to open EXS24, click edit in the top right hand corner, then go to Zone > Load Multiple Samples. At this point you can load up the samples and map them to any key you want. Then Save your EXS24 instrument.
This is going to be a laborious and time-consuming process, so I'd look for the .exs file first, as I know most of the Vengeance sample libraries have them.
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