If an instrument approach is based on 'traditional' navaids (ILS, VOR, NDB) then there would be no difference. If the approach is PBN/RNP/RNAV/GPS/GNSS (pick your abbreviation, they're all in use) then it's based on satellite technology. If there is an augmentation system eg EGNOS (WAAS in US) then it is more accurate and you can have a lower approach minima.
https://www.aurora.nats.co.uk/htmlAI...hics/40521.pdf
This link should show the RNAV approach to Barra RW 25. In the bottom left corner you can see the approach minima in feet - LPV refers to EGNOS augmentation, LNAV without, and there you can see the differences.