inbred, it looks like you’ve bought a nice one there!
The earlier Golf and A3 had the K03 turbo, cable throttle, NVVT engine.
MY2000 Golf 150 had K03 turbo, NVVT but was DBW(drive by wire) throttle.
The later 150 and 180 (all of them) had the K03s, VVT engine, and DBW.
The K04 is on the 210, 225 and 240 engined cars early ones are NVVT later ones VVT all DBW. These engines run a lower compression to the lower powered ones as well.
If you are looking at remapping make sure the car is 100% healthy first (or have someone else do it!), whilst the engines are pretty reliable coilpacks, plugs, vac lines, boost hoses, DV, etc, etc. can all expire over time and lots of use.
Don’t go chasing peak figures, it’s the power/torque under the curve that will give you a nicer car to drive!