PZ-90.11 - EPSG:9475

WKT

GEOGCS["PZ-90.11", 
	DATUM["Parametry_Zemli_1990.11", 
		SPHEROID["PZ_1990", 6378136.0, 298.257839303]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["PZ-90.11", 
	DYNAMIC[
		FRAMEEPOCH[2010.0]], 
	DATUM["Parametry_Zemli_1990.11", 
		ELLIPSOID["PZ_1990", 6378136.0, 298.257839303]], 
	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", "9475"]]

Data from @esri/proj-codes

{
  "wkid": 9475,
  "latestWkid": 9475,
  "macro": "PE_GCS_PZ_1990_11",
  "name": "PZ-90.11",
  "wkt": "GEOGCS[\"PZ-90.11\",DATUM[\"Parametry_Zemli_1990.11\",SPHEROID[\"PZ_1990\",6378136.0,298.257839303]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"PZ-90.11\",DYNAMIC[FRAMEEPOCH[2010.0]],DATUM[\"Parametry_Zemli_1990.11\",ELLIPSOID[\"PZ_1990\",6378136.0,298.257839303]],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\",\"9475\"]]",
  "description": "PZ-90.11",
  "authority": "EPSG",
  "version": "10.004(13.2.0)",
  "deprecated": "no",
  "areaname": "World",
  "extent": {
    "slat": -90,
    "nlat": 90,
    "llon": -180,
    "rlon": 180
  },
  "frameEpoch": 2010,
  "deformationModel": ""
}