you need the ability to do things like detune the sounds like the original hardware did (i.e. with all the technical flaws, not the same way that today's super hi quality sampler programs do) and replicate things like how the open hi-hat is actually a loop of the closed hi-hat sound and the unique way you extend the release of the hi-hat sounds. The other thing to watch for is the accidental slight delay built into in the snare sample which often gets trimmed off in sample libraries but is an essential element in recreating the reknowed feel/swing of the original.
Changing pitch is just how quickly or slowly you play back the sample, I don’t recall any tuning issues on those early samplers and it would be even less of a perceived problem on something that doesn’t last for very long.
If the samples have been taken from an original machine then the open hi hat will be as per the original and won’t need any clever programming to emulate the original.
If you’re right about the snare sample it will sound late when used normally and only sound right when used when you need ‘feel/swing’, I think most people would prefer an accurate start point for a sample than a historically accurate one.