RGF93 v2b CC42 - EPSG:9842

WKT

PROJCS["RGF93_v2b_CC42", 
	GEOGCS["RGF93_v2b", 
		DATUM["Reseau_Geodesique_Francais_1993_v2b", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Lambert_Conformal_Conic"], 
	PARAMETER["False_Easting", 1700000.0], 
	PARAMETER["False_Northing", 1200000.0], 
	PARAMETER["Central_Meridian", 3.0], 
	PARAMETER["Standard_Parallel_1", 41.25], 
	PARAMETER["Standard_Parallel_2", 42.75], 
	PARAMETER["Latitude_Of_Origin", 42.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["RGF93_v2b_CC42", 
	BASEGEOGCRS["RGF93_v2b", 
		DATUM["Reseau_Geodesique_Francais_1993_v2b", 
			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]], 
	CONVERSION["Lambert_Conformal_Conic", 
		METHOD["Lambert_Conformal_Conic"], 
		PARAMETER["False_Easting", 1700000.0], 
		PARAMETER["False_Northing", 1200000.0], 
		PARAMETER["Central_Meridian", 3.0], 
		PARAMETER["Standard_Parallel_1", 41.25], 
		PARAMETER["Standard_Parallel_2", 42.75], 
		PARAMETER["Latitude_Of_Origin", 42.0]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "9842"]]

Data from @esri/proj-codes

{
  "wkid": 9842,
  "latestWkid": 9842,
  "gcsWkid": 9782,
  "macro": "PE_PCS_RGF93_V2B_CC42",
  "name": "RGF93_v2b_CC42",
  "wkt": "PROJCS[\"RGF93_v2b_CC42\",GEOGCS[\"RGF93_v2b\",DATUM[\"Reseau_Geodesique_Francais_1993_v2b\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",1700000.0],PARAMETER[\"False_Northing\",1200000.0],PARAMETER[\"Central_Meridian\",3.0],PARAMETER[\"Standard_Parallel_1\",41.25],PARAMETER[\"Standard_Parallel_2\",42.75],PARAMETER[\"Latitude_Of_Origin\",42.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"RGF93_v2b_CC42\",BASEGEOGCRS[\"RGF93_v2b\",DATUM[\"Reseau_Geodesique_Francais_1993_v2b\",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]],CONVERSION[\"Lambert_Conformal_Conic\",METHOD[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",1700000.0],PARAMETER[\"False_Northing\",1200000.0],PARAMETER[\"Central_Meridian\",3.0],PARAMETER[\"Standard_Parallel_1\",41.25],PARAMETER[\"Standard_Parallel_2\",42.75],PARAMETER[\"Latitude_Of_Origin\",42.0]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"9842\"]]",
  "description": "RGF93 v2b CC42",
  "authority": "EPSG",
  "version": "10.034(13.1.0)",
  "deprecated": "no",
  "areaname": "France - mainland south of 43~N and Corsica",
  "extent": {
    "slat": 41.31,
    "nlat": 43.07,
    "llon": -1.06,
    "rlon": 9.63
  }
}