Well, some of the drum-machine sounds will have been sampled, and some of them will have been synthesized, so it gets kind of murky. In your case, your drum-sound samples may be re-samples of certain sounds (so they may have some EQ or FX added).
A drum-machine (whether physical or virtual) is a device that uses synthesized or sampled drum sounds (individual parts of the kit) to create rhythm patterns and drum grooves for songs by chaining various patterns and fills together (so there's a sequencing aspect as well). It is a machine that emulates a real drummer for production or live performances purposes, when a real drummer and drum-set are not available or for some reason (stylistically or financially) undesireable.
A sampler (whether hardware or software/virtual) is a device that records sound clips and plays them back either through live performer manipulation or through sequencing or MIDI control. Samplers like the MPC series became de facto drum-machines because of their use as a total hardware production solution for Hip-Hop producers (late 80's to early 2000's?) before DAWS and virtual instruments became such a big factor. So some people from the Hip-Hop tradition call something like the MPC a "drum-machine," even though it's much more, and in some ways, less. Two different devices that have the potential to cross into each other's territory...
GJ
