Are there different EPSG codes for 6 digit, 7 digit and 8 digit UTM Zone32 coordinate systems (CRS)?

I get data sent to me in various flavours of EPSG:25832. Unfortunately, everyone thinks that their own EPSG:25832 is the correct one. Some send data with the 32 at the front, others with just a 2, and most with the 32 left off and only the False easting of 500,000m

So, which is the correct EPSG:25832? 6 digit, 7 digit or 8 digit? ArcGIS recognises all, but have also various names for them too. E.g in Projection / National Grids / Germany I see 4 different "ETRS 1989 UTM Zone 32N.prj" Files for 6 digits, 7 digits, and 8 digits and one without and digits suffix which is also just the 6 Digit CRS. Also to make things worse there is also ETRS 1989 UTM Zone N32" (((!!! N32 instead of 32N !!!)))with the 32 at the front again!

In Projected / UTM / Europe/ there is also "ETRS 1989 UTM Zone 32N.prj" which doesn´t begin with 32.

Can anyone standardize this for me? Has sometime tampered with my CRS Directory in order to confuse me?