Closer to you than me someone is collecting & collating Jack info, several pages (plus spanners!) you need to go a fair way down but the difference between E27N and E1A are noted
https://www.ozwrenches.com/jacks-OS.htm
HTH, there is a lot to be said for a properly designed screw jack
edit to add Lurking elsewhere on this forum
Assuming your tractor is a Diesel, the following is the Export Tool Kit.
N1725 Adaptor Water Ballast Valve
O1A17015 7/16x1/2 Open Ender
O1A17016 9/16x5/8 Open Ender
N17016 7/16x5/8 Wrench (Capscrew)
B17020 Screwdriver
N17021A or E1ADKN 17021 Adjustable Wrench
B17025 Pliers
N17029 Open Ender 2 3/16 Hex
E27N 17034 Handle Wheel Spanner
51 17035 Wheel Spanner
E27N 17080A Jack Assy
E1ADDN17098 Injector Lifting Bar
E1ADDN 17017 Open Ender 3/4
E1ADKN 17018 Key 1/2" L
N 17125 or E1ADKN 17125 Grease Gun
For Petrol or Kero Tractors add-
EOA 17017 Tube Socket - Spark Plug
E27N 17022 Screwdriver/Point Gauge(Magneto)
19E 17049 Tommy Bar
N 17079 Carby Jet Key
E1ADKN 17052 Pump (Spark Plug Air)
For Petrol or Kero Tractors Delete-
E1A DDN 17098
E1A DDN 17017