PNG94 - EPSG:5546

WKT

GEOGCS["GCS_PNG94", 
	DATUM["D_Papua_New_Guinea_Geodetic_Datum_1994", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_PNG94", 
	DATUM["D_Papua_New_Guinea_Geodetic_Datum_1994", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Latitude (lat)", north, 
		ORDER[1]], 
	AXIS["Longitude (lon)", east, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["EPSG", "5546"]]

Data from @esri/proj-codes

{
  "wkid": 5546,
  "latestWkid": 5546,
  "macro": "PE_GCS_PNG94",
  "name": "GCS_PNG94",
  "wkt": "GEOGCS[\"GCS_PNG94\",DATUM[\"D_Papua_New_Guinea_Geodetic_Datum_1994\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_PNG94\",DATUM[\"D_Papua_New_Guinea_Geodetic_Datum_1994\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"EPSG\",\"5546\"]]",
  "description": "PNG94",
  "authority": "EPSG",
  "version": "7.8.2(10.1.0)",
  "deprecated": "no",
  "areaname": "Papua New Guinea",
  "extent": {
    "slat": -14.75,
    "nlat": 2.58,
    "llon": 139.2,
    "rlon": 162.81
  }
}