There are resampling options in SNAP. They can be used in the Desktop App or on the command line.
In the Desktop select Raster / Geometric Operations / Resampling or Optical / Geometric / S2 Resampling from the menu. But I think there was an issue with the latter. Not sure. You can try.
For differences between both see:
On the command line you can type the following to get help on the usage: