What is correct format for Krovak Modified Esri WKT

DiarmuidKieran — Mon, 05 Dec 2022 12:37:58 GMT

I wish to be able to identify a projected coordinate system that uses the operation "Krovak Modified" using ESRI Wkt.

From the epsg.io website, one such projected coordinate system is epsg code 5515:
https://epsg.io/5515
The Esri Wkt for this projected coordinate system is given on this page as follows:
PROJCS["S-JTSK_05_Modified_Krovak",
GEOGCS["GCS_S_JTSK/05",
DATUM["D_S_JTSK_05",
SPHEROID["Bessel_1841",6377397.155,299.1528128]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Krovak_Modified"],
PARAMETER["Latitude of projection centre",49.5],
PARAMETER["Longitude of origin",24.8333333333333],
PARAMETER["Co-latitude of cone axis",30.2881397222222],
PARAMETER["Latitude of pseudo standard parallel",78.5],
PARAMETER["Scale factor on pseudo standard parallel",0.9999],
PARAMETER["False easting",5000000.0],
PARAMETER["False northing",5000000.0],
UNIT["Meter",1.0]]
However, the Krovak Modified operation uses a lot of parameters which are not listed in the above Wkt,
C1, C2, C3, XY_Plane_Rotation and others.
How come those parameters are not listed in the above ESRI Well known text ?
I cannot find 5515 on the following site:
https://spatialreference.org/ref/epsg/5515/

Is the WKT given on the epsg.io website for this projected crs correct, or is there some more authoritative source ?
If the WKT abov is correct, then if I produce a WKT in a format which contains all the additional parameters mentioned, will it still be recognised by ESRI ? Is there some official ESRI online database where I can enter WKT I generate and check if it is recognised ?

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What is correct format for Krovak Modified Esri WKT